chore: 集成 LLM 增强 — config/main/articles schema/workers + .env.example 加 Agnes 配置

backend/app/models/__init__.py

@@ -5,6 +5,7 @@
 from app.models.api_token import ApiToken  # noqa: F401
 from app.models.article import Article  # noqa: F401
 from app.models.bookmark import Bookmark  # noqa: F401
+from app.models.llm_setting import LlmSetting  # noqa: F401
 from app.models.source import Source, SourceKind  # noqa: F401
 from app.models.subscription import Subscription  # noqa: F401
 from app.models.user import User, UserRole  # noqa: F401
@@ -13,6 +14,7 @@ __all__ = [
     "ApiToken",
     "Article",
     "Bookmark",
+    "LlmSetting",
     "Source",
     "SourceKind",
     "Subscription",