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/ai_config.py

@@ -0,0 +1,45 @@
+"""AI configuration models."""
+from sqlalchemy import Boolean, Float, ForeignKey, Integer, JSON, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.models.base import Base, TimestampMixin, UUIDMixin
+
+
+class AIProviderConfig(Base, UUIDMixin, TimestampMixin):
+    """AI provider configuration (OpenAI, Anthropic, etc.)."""
+
+    __tablename__ = "ai_provider_configs"
+
+    name: Mapped[str] = mapped_column(String(128), nullable=False)
+    provider: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
+    base_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
+    api_key_encrypted: Mapped[str | None] = mapped_column(Text, nullable=True)
+    default_model: Mapped[str | None] = mapped_column(String(128), nullable=True)
+    timeout: Mapped[int] = mapped_column(Integer, default=60, nullable=False)
+    max_retries: Mapped[int] = mapped_column(Integer, default=3, nullable=False)
+    rate_limit_rpm: Mapped[int] = mapped_column(Integer, default=60, nullable=False)
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
+
+
+class AITaskConfig(Base, UUIDMixin, TimestampMixin):
+    """AI task configuration (which model/skill for which task)."""
+
+    __tablename__ = "ai_task_configs"
+
+    task_type: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
+    name: Mapped[str] = mapped_column(String(128), nullable=False)
+    provider_config_id: Mapped[str | None] = mapped_column(
+        ForeignKey("ai_provider_configs.id", ondelete="SET NULL"), nullable=True
+    )
+    model: Mapped[str] = mapped_column(String(128), nullable=False)
+    skill_id: Mapped[str | None] = mapped_column(
+        ForeignKey("skills.id", ondelete="SET NULL"), nullable=True
+    )
+    temperature: Mapped[float] = mapped_column(Float, default=0.3, nullable=False)
+    max_tokens: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    top_p: Mapped[float] = mapped_column(Float, default=1.0, nullable=False)
+    system_prompt_override: Mapped[str | None] = mapped_column(Text, nullable=True)
+    fallback_config_id: Mapped[str | None] = mapped_column(
+        ForeignKey("ai_task_configs.id", ondelete="SET NULL"), nullable=True
+    )
+    enabled: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)