refactor: 全局适配 ApiFamily/EndpointKind 结构化标识体系

将新的 (ApiFamily, EndpointKind) / `family:kind` 签名体系应用到整个代码库：
- API Handlers: 所有 adapter/handler 使用新的签名格式
- Services: provider, model, usage, cache, auth 等服务层适配
- Database: ProviderEndpoint 新增 api_family/endpoint_kind 字段
- Frontend: Provider 管理、Usage 表格等组件适配
- Tests: 更新所有相关测试用例

src/api/handlers/claude/adapter.py

@@ -16,7 +16,7 @@ from src.api.base.adapter import ApiAdapter, ApiMode
 from src.api.base.context import ApiRequestContext
 from src.api.handlers.base.chat_adapter_base import ChatAdapterBase, register_adapter
 from src.api.handlers.base.chat_handler_base import ChatHandlerBase
-from src.core.api_format import get_header_value
+from src.core.api_format import ApiFamily, get_header_value
 from src.core.logger import logger
 from src.core.optimization_utils import TokenCounter
 from src.models.claude import ClaudeMessagesRequest, ClaudeTokenCountRequest
@@ -58,7 +58,8 @@ class ClaudeChatAdapter(ChatAdapterBase):
     处理 Claude Chat 格式的请求（/v1/messages 端点，进行格式验证）。
     """
 
-    FORMAT_ID = "CLAUDE"
+    FORMAT_ID = "claude:chat"
+    API_FAMILY = ApiFamily.CLAUDE
     BILLING_TEMPLATE = "claude"  # 使用 Claude 计费模板
     name = "claude.chat"
 
@@ -70,7 +71,7 @@ class ClaudeChatAdapter(ChatAdapterBase):
         return ClaudeChatHandler
 
     def __init__(self, allowed_api_formats: list[str] | None = None):
-        super().__init__(allowed_api_formats or ["CLAUDE"])
+        super().__init__(allowed_api_formats)
         logger.info(f"[{self.name}] 初始化Chat模式适配器 | API格式: {self.allowed_api_formats}")
 
     def detect_capability_requirements(

src/api/handlers/claude/handler.py

@@ -9,6 +9,7 @@ from typing import Any
 
 from src.api.handlers.base.chat_handler_base import ChatHandlerBase
 from src.api.handlers.base.utils import extract_cache_creation_tokens
+from src.core.api_format import ApiFamily, EndpointKind
 
 
 class ClaudeChatHandler(ChatHandlerBase):
@@ -21,7 +22,9 @@ class ClaudeChatHandler(ChatHandlerBase):
     - 请求格式：ClaudeMessagesRequest
     """
 
-    FORMAT_ID = "CLAUDE"
+    FORMAT_ID = "claude:chat"
+    API_FAMILY = ApiFamily.CLAUDE
+    ENDPOINT_KIND = EndpointKind.CHAT
 
     def extract_model_from_request(
         self,

src/api/handlers/claude/stream_parser.py

@@ -4,7 +4,6 @@ Claude SSE 流解析器
 解析 Claude Messages API 的 Server-Sent Events 流。
 """
 
-
 import json
 from typing import Any