rebuild(llm): add audited model connectivity tests

next/backend/features/accounts/model_pool.py

@@ -290,6 +290,13 @@ class ModelPoolService:
             raise BusinessError("model_not_configured", "智能解读服务尚未配置。")
         return ModelRuntimeConfig(primary=primary, fallback=fallback)
 
+    def runtime_model(self, model_id: int) -> ModelPoolRecord:
+        with self._database.read() as connection:
+            record = self._repository.get(connection, model_id)
+        if record is None:
+            raise BusinessError("model_not_found", "模型不存在。")
+        return record
+
     def decrypt_api_key(self, record: ModelPoolRecord) -> str:
         return self._cipher.decrypt(record.encrypted_api_key)
 

next/backend/features/accounts/routes.py

@@ -35,9 +35,12 @@ from backend.features.accounts.schemas import (
     ModelInput,
     ModelPoolItemResponse,
     ModelSelectionInput,
+    ModelTestResponse,
     ModelUpdateInput,
     PasswordChangeInput,
 )
+from backend.http.errors import AppError
+from backend.llm.gateway import LLMGatewayError
 
 router = APIRouter()
 
@@ -312,3 +315,16 @@ def delete_model(
 ) -> MessageResponse:
     request.app.state.container.model_pool.delete(model_id)
     return MessageResponse(message="模型已删除。")
+
+
+@router.post("/admin/models/{model_id}/test", response_model=ModelTestResponse)
+def test_model(
+    request: Request,
+    model_id: Annotated[int, Path(ge=1)],
+    principal: AdminWritePrincipal,
+) -> dict[str, object]:
+    try:
+        return request.app.state.container.llm.test_model(principal, model_id)
+    except LLMGatewayError as exc:
+        status = 404 if exc.code == "model_not_found" else 503
+        raise AppError(exc.code, str(exc), status) from exc

next/backend/features/accounts/schemas.py

@@ -119,3 +119,10 @@ class ModelPoolItemResponse(BaseModel):
 class ModelSelectionInput(BaseModel):
     primary_model_id: int = Field(ge=1)
     fallback_model_id: int | None = Field(default=None, ge=1)
+
+
+class ModelTestResponse(BaseModel):
+    connected: bool
+    message: str
+    duration_ms: int = Field(ge=0)
+    request_id: str