افزودن ارائه‌دهندهٔ agy (Google Antigravity) با لاگین headless و پول چرخشی اکانت

- Adapter اکانت‌محور با چرخش round-robin و بنچ‌شدن خودکار روی ۴۲۹/۴۰۱
- ورود ادمین از طریق URL بازگشتی گوگل (PKCE) و ذخیرهٔ رمزنگاری‌شدهٔ refresh token
- صفحهٔ مدیریت اکانت‌های agy در پنل ادمین به همراه تست و فعال/غیرفعال‌سازی
- مهاجرت Alembic b1c2d3e4f5a6 برای ستون‌های اکانت agy
- seed همیشه کاتالوگ agy را می‌سازد و فقط با AI_DEFAULT_PROVIDER=agy مسیریابی می‌شود

apps/api/app/application/ports/model_provider.py

@@ -44,13 +44,21 @@ class ModelProviderPort(Protocol):
         self,
         *,
         model: AiModel,
-        credential: ModelCredential | None,
+        credential: ModelCredential | None = None,
+        credentials: list[ModelCredential] | None = None,
         messages: list[ChatMessage],
         system: str = "",
         temperature: float = 0.2,
         max_tokens: int = 2048,
     ) -> ModelResponse:
-        """Run one completion. Must raise ``ProviderUnavailableError`` on failure."""
+        """Run one completion. Must raise ``ProviderUnavailableError`` on failure.
+
+        ``credential`` is the single active credential (the only input key-based
+        providers need). ``credentials`` is the full usable pool: providers whose
+        accounts rotate (agy) accept it and fan out across the set, keeping one
+        account's rate limit from becoming everyone's outage; providers without
+        a pool ignore it.
+        """
         ...
 
     async def health(self) -> ModelHealth:

apps/api/app/application/services/workforce_service.py

@@ -714,10 +714,17 @@ class WorkforceService:
     ) -> str:
         """Run one completion and record its usage. The single model entry point."""
         model = await self._resolve_model(employee)
-        credential = await self.credentials.get_active_for_provider(model.provider_id)
+        # Pool-aware: rotation providers (agy) fan out across every usable
+        # account; key-based providers simply get their one active credential.
+        pool = await self.credentials.list_active_for_provider(model.provider_id)
+        credential = pool[0] if pool else None
 
         response = await self.provider.complete(
-            model=model, credential=credential, messages=messages, system=system
+            model=model,
+            credential=credential,
+            credentials=pool or None,
+            messages=messages,
+            system=system,
         )
 
         await self._record_usage(