feat: Initial commit - Task Reporter incident response system

Complete implementation of the production line incident response system (生產線異常即時反應系統) including:

Backend (FastAPI):
- User authentication with AD integration and session management
- Chat room management (create, list, update, members, roles)
- Real-time messaging via WebSocket (typing indicators, reactions)
- File storage with MinIO (upload, download, image preview)

Frontend (React + Vite):
- Authentication flow with token management
- Room list with filtering, search, and pagination
- Real-time chat interface with WebSocket
- File upload with drag-and-drop and image preview
- Member management and room settings
- Breadcrumb navigation
- 53 unit tests (Vitest)

Specifications:
- authentication: AD auth, sessions, JWT tokens
- chat-room: rooms, members, templates
- realtime-messaging: WebSocket, messages, reactions
- file-storage: MinIO integration, file management
- frontend-core: React SPA structure

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/modules/auth/__init__.py

@@ -0,0 +1,21 @@
+"""Authentication module - Reusable authentication system with AD API integration
+
+This module provides:
+- Dual-token session management (internal + AD tokens)
+- Automatic AD token refresh with retry limit (max 3 attempts)
+- 3-day inactivity timeout
+- Encrypted password storage for auto-refresh
+- FastAPI dependency injection for protected routes
+
+Usage in other modules:
+    from app.modules.auth import get_current_user
+
+    @router.get("/protected-endpoint")
+    async def my_endpoint(current_user: dict = Depends(get_current_user)):
+        # current_user contains: {"username": "...", "display_name": "..."}
+        return {"user": current_user["display_name"]}
+"""
+from app.modules.auth.router import router
+from app.modules.auth.dependencies import get_current_user
+
+__all__ = ["router", "get_current_user"]