Initial commit: Pixel AI comic/video creation platform

- FastAPI backend with SQLModel, Alembic migrations, AgentScope agents
- Next.js 15 frontend with React 19, Tailwind, Zustand, React Flow
- Multi-provider AI system (DashScope, Kling, MiniMax, Volcengine, OpenAI, etc.)
- All HTTP clients migrated from sync requests to async httpx
- Admin-managed API keys via environment variables
- SSRF vulnerability fixed in ensure_url()

backend/src/auth/__init__.py

@@ -0,0 +1,41 @@
+"""
+认证授权模块
+
+提供 JWT Token 认证、OAuth2 集成和 HTTP 轮询状态查询。
+"""
+
+from src.auth.jwt import (
+    create_access_token,
+    create_refresh_token,
+    verify_token,
+    verify_refresh_token,
+    TokenPayload,
+    TokenPair,
+)
+from src.auth.dependencies import (
+    get_current_user,
+    get_current_active_user,
+    require_permissions,
+)
+from src.auth.middleware import AuthMiddleware
+from src.auth.models import UserAuth, TokenData, RefreshTokenRequest
+
+__all__ = [
+    # JWT
+    "create_access_token",
+    "create_refresh_token",
+    "verify_token",
+    "verify_refresh_token",
+    "TokenPayload",
+    "TokenPair",
+    # Dependencies
+    "get_current_user",
+    "get_current_active_user",
+    "require_permissions",
+    # Middleware
+    "AuthMiddleware",
+    # Models
+    "UserAuth",
+    "TokenData",
+    "RefreshTokenRequest",
+]