feat: 新增 Kiro 适配器、OAuth 改进与多项功能增强

- 新增 Kiro provider 适配器（EventStream 协议解析、令牌管理、用量追踪）
- 重构 OAuth 账户管理与统一配额机制
- 重构 Handler 基类（CLI adapter/handler、请求构建器、流处理器）
- 增强缓存监控后端 API 与前端可视化
- 改进 Gemini 格式标准化器与请求头处理
- Antigravity/Codex 适配器更新，移除旧 metadata_collector
- 新增数据库迁移：proxy provider API keys
- 前端 UI 多项优化

Co-Authored-By: AAEE86 <ppk0227@hotmail.com>

src/core/api_format/conversion/normalizers/gemini.py

@@ -60,6 +60,74 @@ from src.core.api_format.conversion.stream_events import (
     ToolCallDeltaEvent,
 )
 from src.core.api_format.conversion.stream_state import StreamState
+from src.core.api_format.schema_utils import clean_gemini_schema as _clean_gemini_schema
+
+# Valid Gemini Part data-oneof field names (camelCase + snake_case).
+_VALID_PART_DATA_FIELDS = frozenset(
+    {
+        "text",
+        "inlineData",
+        "inline_data",
+        "functionCall",
+        "function_call",
+        "functionResponse",
+        "function_response",
+        "fileData",
+        "file_data",
+        "executableCode",
+        "executable_code",
+        "codeExecutionResult",
+        "code_execution_result",
+        "videoMetadata",
+        "video_metadata",
+    }
+)
+
+
+def _is_valid_gemini_part(part: Any) -> bool:
+    """Return True if *part* has at least one recognised Gemini data field."""
+    if not isinstance(part, dict) or not part:
+        return False
+    return bool(part.keys() & _VALID_PART_DATA_FIELDS)
+
+
+def compact_gemini_contents(contents: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    """Strip invalid parts, drop empty contents, merge consecutive same-role.
+
+    Gemini requires every content to have at least one valid part (with a
+    recognised data-oneof field), and strictly alternating user/model roles.
+    Cross-format conversions (e.g. Responses API reasoning items) may produce
+    contents with no Gemini-compatible parts, or consecutive same-role entries
+    after filtering.
+    """
+    # 1. Strip invalid parts, then drop contents with no valid parts remaining.
+    #    Use shallow copy to avoid mutating the caller's original dicts.
+    non_empty: list[dict[str, Any]] = []
+    for c in contents:
+        parts = c.get("parts")
+        if not isinstance(parts, list):
+            continue
+        valid_parts = [p for p in parts if _is_valid_gemini_part(p)]
+        if valid_parts:
+            c = {**c, "parts": valid_parts}
+            non_empty.append(c)
+
+    # 2. Merge consecutive same-role entries.
+    if not non_empty:
+        return non_empty
+
+    merged: list[dict[str, Any]] = [non_empty[0]]
+    for c in non_empty[1:]:
+        if c.get("role") == merged[-1].get("role"):
+            prev_parts = merged[-1].get("parts")
+            if isinstance(prev_parts, list):
+                prev_parts.extend(c.get("parts") or [])
+            else:
+                merged[-1]["parts"] = list(c.get("parts") or [])
+        else:
+            merged.append(c)
+
+    return merged
 
 
 class GeminiNormalizer(FormatNormalizer):
@@ -206,22 +274,22 @@ class GeminiNormalizer(FormatNormalizer):
             self._is_antigravity_thinking_enabled(internal) if is_antigravity else False
         )
 
-        # tools/tool_choice
+        # tools/tool_choice — clean unsupported JSON Schema fields from parameters
         tools = None
         if internal.tools:
-            tools = [
-                {
-                    "function_declarations": [
-                        {
-                            "name": t.name,
-                            "description": t.description,
-                            "parameters": t.parameters or {},
-                            **(t.extra.get("gemini_function_declaration") or {}),
-                        }
-                        for t in internal.tools
-                    ]
+            func_decls: list[dict[str, Any]] = []
+            for t in internal.tools:
+                params = dict(t.parameters) if t.parameters else {}
+                if params:
+                    _clean_gemini_schema(params)
+                decl: dict[str, Any] = {
+                    "name": t.name,
+                    "description": t.description,
+                    "parameters": params,
+                    **(t.extra.get("gemini_function_declaration") or {}),
                 }
-            ]
+                func_decls.append(decl)
+            tools = [{"function_declarations": func_decls}]
 
         tool_config = None
         if internal.tool_choice:
@@ -286,7 +354,7 @@ class GeminiNormalizer(FormatNormalizer):
                 if "thinking_config" in orig_gc and "thinkingConfig" not in generation_config:
                     generation_config["thinkingConfig"] = orig_gc["thinking_config"]
 
-        contents: list[dict[str, Any]] = []
+        raw_contents: list[dict[str, Any]] = []
         last_idx = len(internal.messages) - 1
         for idx, msg in enumerate(internal.messages):
             content = self._internal_message_to_content(
@@ -327,7 +395,12 @@ class GeminiNormalizer(FormatNormalizer):
                         content = dict(content)
                         content["parts"] = [dummy_part, *parts]
 
-            contents.append(content)
+            raw_contents.append(content)
+
+        # Drop contents with empty parts (e.g. reasoning-only messages that have
+        # no Gemini-compatible representation) and merge consecutive same-role
+        # contents — Gemini requires strictly alternating user/model turns.
+        contents = compact_gemini_contents(raw_contents)
 
         result: dict[str, Any] = {
             "contents": contents,

src/core/api_format/headers.py

@@ -21,12 +21,13 @@ from src.core.api_format.metadata import (
     get_protected_keys_for_endpoint,
 )
 from src.core.api_format.signature import EndpointSignature, parse_signature_key
+from src.core.logger import logger
 
 # =============================================================================
 # 头部常量定义
 # =============================================================================
 
-# 转发给上游时需要剔除的头部（系统管理 + 认证替换）
+# 转发给上游时需要剔除的头部（系统管理 + 认证替换 + 客户端/代理元数据）
 UPSTREAM_DROP_HEADERS: frozenset[str] = frozenset(
     {
         # 认证头 - 会被替换为 Provider 的认证
@@ -40,6 +41,13 @@ UPSTREAM_DROP_HEADERS: frozenset[str] = frozenset(
         "connection",
         # 编码头 - 避免客户端请求 brotli/zstd 但 httpx 不支持
         "accept-encoding",
+        # 反向代理 / 网关注入的头部 - 属于本站基础设施，不应泄露给上游
+        "x-real-ip",
+        "x-real-proto",
+        "x-forwarded-for",
+        "x-forwarded-proto",
+        "x-forwarded-host",
+        "x-forwarded-port",
     }
 )
 
@@ -324,8 +332,23 @@ class HeaderBuilder:
         return self
 
     def build(self) -> dict[str, str]:
-        """构建最终的头部字典"""
-        return {original_key: value for original_key, value in self._headers.values()}
+        """构建最终的头部字典
+
+        Safety net: 跳过值中包含非 ASCII 字符的头部并记录警告，
+        防止 httpx 发送时抛出 ``UnicodeEncodeError``。
+        """
+        result: dict[str, str] = {}
+        for original_key, value in self._headers.values():
+            try:
+                value.encode("ascii")
+            except (UnicodeEncodeError, UnicodeDecodeError):
+                logger.warning(
+                    "Dropping non-ASCII header before upstream request: {}",
+                    original_key,
+                )
+                continue
+            result[original_key] = value
+        return result
 
 
 def build_upstream_headers_for_endpoint(
@@ -565,3 +588,18 @@ def get_extra_headers_from_endpoint(endpoint: Any) -> dict[str, str] | None:
     """
     header_rules = getattr(endpoint, "header_rules", None)
     return extract_set_headers_from_rules(header_rules)
+
+
+# =============================================================================
+# 请求头辅助工具
+# =============================================================================
+
+
+def set_accept_if_absent(headers: dict[str, str], value: str = "text/event-stream") -> None:
+    """Set the ``Accept`` header only if not already present (case-insensitive check).
+
+    Used by stream handlers to request SSE format from upstream without overriding
+    provider-specific Accept headers (e.g. Kiro's ``application/vnd.amazon.eventstream``).
+    """
+    if not any(k.lower() == "accept" for k in headers):
+        headers["Accept"] = value

src/core/api_format/schema_utils.py

@@ -0,0 +1,60 @@
+"""JSON Schema cleaning utilities shared across Gemini-compatible providers.
+
+Google Gemini's function declaration API does not support certain JSON Schema
+fields.  These must be stripped recursively from tool parameter schemas before
+forwarding to any Gemini-based upstream (native Gemini, Antigravity, etc.).
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+# JSON Schema fields unsupported by Google Gemini's function declaration API.
+GEMINI_FORBIDDEN_SCHEMA_FIELDS: frozenset[str] = frozenset(
+    {
+        "$schema",
+        "additionalProperties",
+        "const",
+        "contentEncoding",
+        "contentMediaType",
+        "default",
+        "exclusiveMaximum",
+        "exclusiveMinimum",
+        "multipleOf",
+        "patternProperties",
+        "propertyNames",
+    }
+)
+
+
+def clean_gemini_schema(schema: dict[str, Any]) -> None:
+    """Recursively strip JSON Schema fields unsupported by Gemini.
+
+    Modifies *schema* in-place.  Recurses into ``properties``, ``items``,
+    and ``anyOf`` / ``oneOf`` / ``allOf`` sub-schemas.
+    """
+    for field in GEMINI_FORBIDDEN_SCHEMA_FIELDS:
+        schema.pop(field, None)
+
+    props = schema.get("properties")
+    if isinstance(props, dict):
+        for prop_schema in props.values():
+            if isinstance(prop_schema, dict):
+                clean_gemini_schema(prop_schema)
+
+    items = schema.get("items")
+    if isinstance(items, dict):
+        clean_gemini_schema(items)
+
+    for combo_key in ("anyOf", "oneOf", "allOf"):
+        combo = schema.get(combo_key)
+        if isinstance(combo, list):
+            for sub in combo:
+                if isinstance(sub, dict):
+                    clean_gemini_schema(sub)
+
+
+__all__ = [
+    "GEMINI_FORBIDDEN_SCHEMA_FIELDS",
+    "clean_gemini_schema",
+]