style: 统一使用 PEP 604/585 现代类型语法

- Optional[X] → X | None
- Dict[X, Y] → dict[X, Y]
- List[X] → list[X]
- Tuple[X, Y] → tuple[X, Y]
- Set[X] → set[X]

涉及 10 个文件，共约 50 处改动。

src/api/handlers/base/base_handler.py

@@ -10,18 +10,18 @@
         self,
         request: Any,                           # 解析后的请求模型
         http_request: Request,                  # FastAPI Request 对象
-        original_headers: Dict[str, str],       # 原始请求头
-        original_request_body: Dict[str, Any],  # 原始请求体
-        query_params: Optional[Dict[str, str]] = None,  # 查询参数
+        original_headers: dict[str, str],       # 原始请求头
+        original_request_body: dict[str, Any],  # 原始请求体
+        query_params: dict[str, str] | None = None,  # 查询参数
     ) -> StreamingResponse: ...
 
     async def process_sync(
         self,
         request: Any,
         http_request: Request,
-        original_headers: Dict[str, str],
-        original_request_body: Dict[str, Any],
-        query_params: Optional[Dict[str, str]] = None,
+        original_headers: dict[str, str],
+        original_request_body: dict[str, Any],
+        query_params: dict[str, str] | None = None,
     ) -> JSONResponse: ...
 """
 

src/api/handlers/base/chat_adapter_base.py

@@ -565,7 +565,7 @@ class ChatAdapterBase(ApiAdapter):
                 "cache_cost": float,
                 "request_cost": float,
                 "total_cost": float,
-                "tier_index": Optional[int],  # 命中的阶梯索引
+                "tier_index": int | None,  # 命中的阶梯索引
             }
         """
         # 计算总输入上下文（使用子类可覆盖的方法）

src/api/handlers/gemini/adapter.py

@@ -61,9 +61,9 @@ class GeminiChatAdapter(ChatAdapterBase):
 
     def detect_capability_requirements(
         self,
-        headers: Dict[str, str],  # noqa: ARG002 - 预留
-        request_body: Optional[Dict[str, Any]] = None,
-    ) -> Dict[str, bool]:
+        headers: dict[str, str],  # noqa: ARG002 - 预留
+        request_body: dict[str, Any] | None = None,
+    ) -> dict[str, bool]:
         """检测是否需要 Gemini Files API 能力"""
         if request_body and extract_file_names_from_request(request_body):
             return {"gemini_files_api": True}

src/api/handlers/gemini/handler.py

@@ -27,8 +27,8 @@ class GeminiChatHandler(ChatHandlerBase):
     async def _resolve_preferred_key_ids(
         self,
         model_name: str,  # noqa: ARG002 - 仅做文件绑定
-        request_body: Optional[Dict[str, Any]] = None,
-    ) -> Optional[list[str]]:
+        request_body: dict[str, Any] | None = None,
+    ) -> list[str] | None:
         """
         从 files/xxx 绑定关系中解析优先 Key ID 列表。
 

src/api/public/gemini_files.py

@@ -60,7 +60,7 @@ HEADERS_TO_REMOVE = frozenset({
 })
 
 
-def _extract_gemini_api_key(request: Request) -> Optional[str]:
+def _extract_gemini_api_key(request: Request) -> str | None:
     """
     从请求中提取 Gemini API Key
 
@@ -76,9 +76,9 @@ def _extract_gemini_api_key(request: Request) -> Optional[str]:
 
 
 def _build_upstream_headers(
-    original_headers: Dict[str, str],
+    original_headers: dict[str, str],
     upstream_api_key: str,
-) -> Dict[str, str]:
+) -> dict[str, str]:
     """
     构建上游请求头
 
@@ -105,7 +105,7 @@ def _build_upstream_headers(
 def _build_upstream_url(
     base_url: str,
     path: str,
-    query_params: Optional[Dict[str, Any]] = None,
+    query_params: dict[str, Any] | None = None,
     is_upload: bool = False,
 ) -> str:
     """
@@ -145,8 +145,8 @@ def _build_upstream_url(
 def _resolve_files_model_name(
     db: Session,
     user_api_key: ApiKey,
-    user: Optional[User],
-) -> Optional[str]:
+    user: User | None,
+) -> str | None:
     """
     为 Files API 选择一个可用的模型名（用于 Key 选择与权限过滤）
 
@@ -188,7 +188,7 @@ async def _select_provider_candidate(
     db: Session,
     user_api_key: ApiKey,
     model_name: str,
-) -> Optional[ProviderCandidate]:
+) -> ProviderCandidate | None:
     """选择支持 Files API 的 Provider/Endpoint/Key 组合"""
     scheduler = CacheAwareScheduler()
     candidates, _global_model_id = await scheduler.list_all_candidates(
@@ -210,7 +210,7 @@ async def _select_provider_candidate(
 async def _resolve_upstream_context(
     request: Request,
     db: Session,
-) -> Tuple[str, str, str]:
+) -> tuple[str, str, str]:
     """
     解析上游 Key 与 Base URL
 
@@ -291,10 +291,10 @@ async def _resolve_upstream_context(
 async def _proxy_request(
     method: str,
     upstream_url: str,
-    headers: Dict[str, str],
-    content: Optional[bytes] = None,
-    json_body: Optional[Dict[str, Any]] = None,
-    file_key_id: Optional[str] = None,
+    headers: dict[str, str],
+    content: bytes | None = None,
+    json_body: dict[str, Any] | None = None,
+    file_key_id: str | None = None,
 ) -> Response:
     """
     代理请求到上游 Gemini API
@@ -461,8 +461,8 @@ async def upload_file(
 async def list_files(
     request: Request,
     db: Session = Depends(get_db),
-    pageSize: Optional[int] = None,
-    pageToken: Optional[str] = None,
+    pageSize: int | None = None,
+    pageToken: str | None = None,
 ):
     """
     列出已上传的文件

src/core/vertex_auth.py

@@ -51,7 +51,7 @@ class VertexAuthService:
 
     # Token 缓存：使用 OrderedDict 实现 LRU
     # key = client_email, value = (token, expires_at)
-    _token_cache: OrderedDict[str, Tuple[str, float]] = OrderedDict()
+    _token_cache: OrderedDict[str, tuple[str, float]] = OrderedDict()
     _cache_max_size: int = 100  # 最多缓存 100 个 Service Account 的 Token
 
     # Token 请求端点
@@ -168,7 +168,7 @@ class VertexAuthService:
             raise VertexAuthError(f"Failed to get access token: {e}")
 
     @classmethod
-    def clear_cache(cls, client_email: Optional[str] = None) -> None:
+    def clear_cache(cls, client_email: str | None = None) -> None:
         """
         清除 Token 缓存
 
@@ -181,7 +181,7 @@ class VertexAuthService:
             cls._token_cache.clear()
 
 
-async def get_vertex_access_token(service_account_json: str) -> Tuple[str, str]:
+async def get_vertex_access_token(service_account_json: str) -> tuple[str, str]:
     """
     便捷函数：获取 Vertex AI Access Token 和 Project ID
 

src/models/gemini.py

@@ -55,7 +55,7 @@ class GeminiRequest(BaseModelWithExtras):
 
     model: str | None = Field(default=None, description="模型名称，从 URL 路径提取（内部使用）")
     contents: list[GeminiContent]
-    # 以下字段全部使用 Dict[str, Any] 透传，不做结构验证
+    # 以下字段全部使用 dict[str, Any] 透传，不做结构验证
     system_instruction: dict[str, Any] | None = Field(default=None, alias="systemInstruction")
     tools: list[dict[str, Any]] | None = None
     tool_config: dict[str, Any] | None = Field(default=None, alias="toolConfig")
@@ -88,7 +88,7 @@ class GeminiFileMetadata(BaseModelWithExtras):
     用于上传文件时指定的元数据信息
     """
 
-    display_name: Optional[str] = Field(default=None, alias="displayName")
+    display_name: str | None = Field(default=None, alias="displayName")
 
 
 class GeminiFileUploadRequest(BaseModelWithExtras):
@@ -98,7 +98,7 @@ class GeminiFileUploadRequest(BaseModelWithExtras):
     用于 media.upload API 的请求体
     """
 
-    file: Optional[GeminiFileMetadata] = None
+    file: GeminiFileMetadata | None = None
 
 
 class GeminiFile(BaseModelWithExtras):
@@ -108,20 +108,20 @@ class GeminiFile(BaseModelWithExtras):
     表示已上传到 Gemini API 的文件
     """
 
-    name: Optional[str] = None  # 文件名，格式：files/xxx
-    display_name: Optional[str] = Field(default=None, alias="displayName")
-    mime_type: Optional[str] = Field(default=None, alias="mimeType")
-    size_bytes: Optional[str] = Field(default=None, alias="sizeBytes")
-    create_time: Optional[str] = Field(default=None, alias="createTime")
-    update_time: Optional[str] = Field(default=None, alias="updateTime")
-    expiration_time: Optional[str] = Field(default=None, alias="expirationTime")
-    sha256_hash: Optional[str] = Field(default=None, alias="sha256Hash")
-    uri: Optional[str] = None  # 文件 URI，用于在请求中引用
-    download_uri: Optional[str] = Field(default=None, alias="downloadUri")
-    state: Optional[str] = None  # PROCESSING, ACTIVE, FAILED
-    error: Optional[Dict[str, Any]] = None
+    name: str | None = None  # 文件名，格式：files/xxx
+    display_name: str | None = Field(default=None, alias="displayName")
+    mime_type: str | None = Field(default=None, alias="mimeType")
+    size_bytes: str | None = Field(default=None, alias="sizeBytes")
+    create_time: str | None = Field(default=None, alias="createTime")
+    update_time: str | None = Field(default=None, alias="updateTime")
+    expiration_time: str | None = Field(default=None, alias="expirationTime")
+    sha256_hash: str | None = Field(default=None, alias="sha256Hash")
+    uri: str | None = None  # 文件 URI，用于在请求中引用
+    download_uri: str | None = Field(default=None, alias="downloadUri")
+    state: str | None = None  # PROCESSING, ACTIVE, FAILED
+    error: dict[str, Any] | None = None
     # 视频文件元数据
-    video_metadata: Optional[Dict[str, Any]] = Field(default=None, alias="videoMetadata")
+    video_metadata: dict[str, Any] | None = Field(default=None, alias="videoMetadata")
 
 
 class GeminiFileListResponse(BaseModelWithExtras):
@@ -131,8 +131,8 @@ class GeminiFileListResponse(BaseModelWithExtras):
     用于 files.list API 的响应体
     """
 
-    files: Optional[List["GeminiFile"]] = None
-    next_page_token: Optional[str] = Field(default=None, alias="nextPageToken")
+    files: list["GeminiFile"] | None = None
+    next_page_token: str | None = Field(default=None, alias="nextPageToken")
 
 
 class GeminiFileUploadResponse(BaseModelWithExtras):
@@ -142,7 +142,7 @@ class GeminiFileUploadResponse(BaseModelWithExtras):
     用于 media.upload API 的响应体
     """
 
-    file: Optional[GeminiFile] = None
+    file: GeminiFile | None = None
 
 
 class GeminiFilePart(BaseModelWithExtras):
@@ -153,7 +153,7 @@ class GeminiFilePart(BaseModelWithExtras):
     使用 file_data 字段引用文件 URI
     """
 
-    file_data: Optional[Dict[str, Any]] = Field(default=None, alias="fileData")
+    file_data: dict[str, Any] | None = Field(default=None, alias="fileData")
     # fileData 格式：{"mimeType": "...", "fileUri": "..."}
 
 

src/services/billing/calculator.py

@@ -295,7 +295,7 @@ def calculate_request_cost(
             "cache_cost": float,
             "request_cost": float,
             "total_cost": float,
-            "tier_index": Optional[int],
+            "tier_index": int | None,
         }
     """
     # 构建标准化 usage

src/services/gemini_files_mapping.py

@@ -34,7 +34,7 @@ async def store_file_key_mapping(file_name: str, key_id: str) -> None:
     await CacheService.set(cache_key, str(key_id), ttl_seconds=FILE_MAPPING_TTL_SECONDS)
 
 
-async def get_file_key_mapping(file_name: str) -> Optional[str]:
+async def get_file_key_mapping(file_name: str) -> str | None:
     cache_key = build_file_mapping_key(file_name)
     if not cache_key:
         return None
@@ -50,7 +50,7 @@ async def delete_file_key_mapping(file_name: str) -> None:
         await CacheService.delete(cache_key)
 
 
-def _extract_file_name_from_uri(file_uri: str) -> Optional[str]:
+def _extract_file_name_from_uri(file_uri: str) -> str | None:
     """
     从 fileUri 提取 files/xxx 名称。
 
@@ -70,11 +70,11 @@ def _extract_file_name_from_uri(file_uri: str) -> Optional[str]:
     return None
 
 
-def extract_file_names_from_request(payload: Optional[Dict[str, Any]]) -> Set[str]:
+def extract_file_names_from_request(payload: dict[str, Any] | None) -> set[str]:
     """
     从 Gemini 请求体中提取 fileUri 使用到的 files/xxx 名称集合。
     """
-    results: Set[str] = set()
+    results: set[str] = set()
 
     def walk(node: Any) -> None:
         if isinstance(node, dict):

src/services/provider/transport.py

@@ -72,8 +72,8 @@ def build_provider_url(
     query_params: dict[str, Any] | None = None,
     path_params: dict[str, Any] | None = None,
     is_stream: bool = False,
-    key: Optional["ProviderAPIKey"] = None,
-    decrypted_auth_config: Optional[Dict[str, Any]] = None,
+    key: "ProviderAPIKey" | None = None,
+    decrypted_auth_config: dict[str, Any] | None = None,
 ) -> str:
     """
     根据 endpoint 配置生成请求 URL
@@ -175,7 +175,7 @@ def _resolve_default_path(api_format: str | None) -> str:
 
 # Vertex AI 模型默认 region 映射
 # 用户可以通过 auth_config.model_regions 覆盖
-VERTEX_AI_DEFAULT_MODEL_REGIONS: Dict[str, str] = {
+VERTEX_AI_DEFAULT_MODEL_REGIONS: dict[str, str] = {
     # Gemini 3 系列（使用 global）
     "gemini-3-pro-image-preview": "global",
     # Gemini 2.0 系列
@@ -200,10 +200,10 @@ VERTEX_AI_DEFAULT_MODEL_REGIONS: Dict[str, str] = {
 def _build_vertex_ai_url(
     key: "ProviderAPIKey",
     *,
-    path_params: Optional[Dict[str, Any]] = None,
-    query_params: Optional[Dict[str, Any]] = None,
+    path_params: dict[str, Any] | None = None,
+    query_params: dict[str, Any] | None = None,
     is_stream: bool = False,
-    decrypted_auth_config: Optional[Dict[str, Any]] = None,
+    decrypted_auth_config: dict[str, Any] | None = None,
 ) -> str:
     """
     构建 Vertex AI URL
@@ -236,7 +236,7 @@ def _build_vertex_ai_url(
     from src.core.crypto import crypto_service
 
     # 优先使用传入的已解密配置，避免重复解密
-    auth_config: Dict[str, Any] = {}
+    auth_config: dict[str, Any] = {}
     if decrypted_auth_config:
         auth_config = decrypted_auth_config
     else: