refactor: 前端全面替换 any 为 unknown 并统一错误处理，后端用量记录补写请求头/体

- 前端 API 层、stores、conversation 解析器、组件全面替换 any 为 unknown/具体类型
- 错误处理统一使用 parseApiError/getErrorStatus 替代 err.response?.data?.detail 模式
- 后端 handler/TaskService/UsageLifecycle/StreamTracker 链路传递 request_headers/request_body
- streaming/pending 状态更新时可补写客户端和提供商的请求头及请求体
- 新增 TaskService 和 UsageService 相关测试

src/api/handlers/base/base_handler.py

@@ -325,6 +325,8 @@ class BaseMessageHandler:
                         api_format=api_format,
                         endpoint_api_format=endpoint_api_format,
                         has_format_conversion=has_format_conversion,
+                        provider_request_headers=ctx.provider_request_headers or None,
+                        provider_request_body=ctx.provider_request_body,
                     )
                 finally:
                     db.close()

src/api/handlers/base/chat_handler_base.py

@@ -563,6 +563,8 @@ class ChatHandlerBase(BaseMessageHandler, ABC):
                 capability_requirements=capability_requirements or None,
                 preferred_key_ids=preferred_key_ids or None,
                 request_body_ref=request_body_ref,
+                request_headers=original_headers,
+                request_body=original_request_body,
             )
             stream_generator = exec_result.response
             provider_name = exec_result.provider_name or "unknown"

src/api/handlers/base/chat_sync_executor.py

@@ -160,6 +160,8 @@ class ChatSyncExecutor:
                 capability_requirements=capability_requirements or None,
                 preferred_key_ids=preferred_key_ids or None,
                 request_body_ref=request_body_ref,
+                request_headers=original_headers,
+                request_body=original_request_body,
             )
             actual_provider_name = exec_result.provider_name or "unknown"
             ctx.provider_id = exec_result.provider_id

src/api/handlers/base/cli_event_mixin.py

@@ -445,6 +445,8 @@ class CliEventMixin:
                         api_format=ctx.api_format,
                         endpoint_api_format=ctx.provider_api_format or None,
                         has_format_conversion=ctx.has_format_conversion,
+                        provider_request_headers=ctx.provider_request_headers or None,
+                        provider_request_body=ctx.provider_request_body,
                     )
                 except Exception as e:
                     logger.warning("[{}] 同步更新 streaming 状态失败: {}", self.request_id, e)

src/api/handlers/base/cli_stream_mixin.py

@@ -168,6 +168,8 @@ class CliStreamMixin:
                 capability_requirements=capability_requirements or None,
                 preferred_key_ids=preferred_key_ids or None,
                 request_body_ref=request_body_ref,
+                request_headers=original_headers,
+                request_body=original_request_body,
             )
             stream_generator = exec_result.response
             provider_name = exec_result.provider_name or "unknown"

src/api/handlers/base/cli_sync_mixin.py

@@ -464,6 +464,8 @@ class CliSyncMixin:
                 capability_requirements=capability_requirements or None,
                 preferred_key_ids=preferred_key_ids or None,
                 request_body_ref=request_body_ref,
+                request_headers=original_headers,
+                request_body=original_request_body,
             )
             result = exec_result.response
             actual_provider_name = exec_result.provider_name or "unknown"