Initial commit: RSS platform phase 1 skeleton with code review fixes

Features:
- FastAPI + SQLAlchemy 2.0 async + PostgreSQL/pgvector + Redis backend
- Vue 3 + TypeScript + Element Plus frontend
- JWT auth with access/refresh tokens and revocation
- Admin/member RBAC
- RSS feed CRUD and article listing
- Settings management with Fernet encryption for sensitive values
- Redis distributed lock service
- Alembic initial migration
- Docker Compose development environment

Fixes from code review:
- Fix DB session leak in dependency injection
- Restrict registration to admin only
- Add default admin password warning
- Implement JWT refresh tokens and jti blacklist
- Strengthen password policy
- Use func.count for pagination totals
- Replace NullPool with AsyncAdaptedQueuePool
- Remove init_db from lifespan to enforce alembic migrations
- Add request_id middleware and logging filter
- Fix vite.config.ts env loading
- Add frontend token refresh interceptor
- Add Vue error handler

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/app/models/__init__.py

@@ -0,0 +1,34 @@
+"""Models package."""
+from app.models.ai_config import AIProviderConfig, AITaskConfig
+from app.models.article import CleanedArticle, RawArticle
+from app.models.base import Base, TimestampMixin, UUIDMixin, utc_now
+from app.models.chat import ChatMessage, ChatSession
+from app.models.feed import Feed
+from app.models.lock import Lock
+from app.models.output import Output, OutputTask
+from app.models.reference import ArticleReference, DuplicateGroup
+from app.models.setting import AppSetting
+from app.models.skill import Skill
+from app.models.user import User
+
+__all__ = [
+    "Base",
+    "TimestampMixin",
+    "UUIDMixin",
+    "utc_now",
+    "User",
+    "Feed",
+    "RawArticle",
+    "CleanedArticle",
+    "ArticleReference",
+    "DuplicateGroup",
+    "Skill",
+    "AIProviderConfig",
+    "AITaskConfig",
+    "OutputTask",
+    "Output",
+    "ChatSession",
+    "ChatMessage",
+    "Lock",
+    "AppSetting",
+]