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/schemas/feed.py

@@ -0,0 +1,66 @@
+"""Feed Pydantic schemas."""
+from pydantic import BaseModel, ConfigDict, Field, HttpUrl
+
+
+class FeedBase(BaseModel):
+    """Base feed schema."""
+
+    url: HttpUrl
+    title: str | None = Field(default="", max_length=512)
+    description: str | None = ""
+    category: str | None = Field(default="", max_length=128)
+    is_active: bool = True
+    fetch_interval_minutes: int = Field(default=60, ge=15)
+    priority: int = Field(default=5, ge=1, le=10)
+    parser_config: dict = {}
+    proxy_policy: str = "auto"
+
+
+class FeedCreate(FeedBase):
+    """Feed creation schema."""
+
+    pass
+
+
+class FeedUpdate(BaseModel):
+    """Feed update schema."""
+
+    title: str | None = Field(default=None, max_length=512)
+    description: str | None = None
+    category: str | None = Field(default=None, max_length=128)
+    is_active: bool | None = None
+    fetch_interval_minutes: int | None = Field(default=None, ge=15)
+    priority: int | None = Field(default=None, ge=1, le=10)
+    parser_config: dict | None = None
+    proxy_policy: str | None = None
+
+
+class FeedOut(FeedBase):
+    """Feed output schema."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: str
+    last_fetch_at: str | None = None
+    last_fetch_status: str | None = None
+    last_error: str | None = None
+    error_type: str | None = None
+    success_count: int = 0
+    fail_count: int = 0
+    article_count: int = 0
+    health_status: str = "unknown"
+    created_at: str
+    updated_at: str
+
+    @classmethod
+    def model_validate(cls, obj):
+        """Override to compute health_status and format datetimes."""
+        data = {}
+        for key in obj.__dict__:
+            value = getattr(obj, key)
+            if key in ("created_at", "updated_at", "last_fetch_at") and value is not None:
+                data[key] = value.isoformat()
+            else:
+                data[key] = value
+        data["health_status"] = obj.health_status()
+        return cls.model_construct(**data)