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>

frontend/src/stores/authStore.ts

@@ -0,0 +1,51 @@
+import { create } from 'zustand'
+import { persist } from 'zustand/middleware'
+import type { User } from '../types'
+
+interface AuthState {
+  token: string | null
+  user: User | null
+  isAuthenticated: boolean
+
+  // Actions
+  setAuth: (token: string, displayName: string, username: string) => void
+  clearAuth: () => void
+  updateUser: (user: Partial<User>) => void
+}
+
+export const useAuthStore = create<AuthState>()(
+  persist(
+    (set) => ({
+      token: null,
+      user: null,
+      isAuthenticated: false,
+
+      setAuth: (token: string, displayName: string, username: string) =>
+        set({
+          token,
+          user: { username, display_name: displayName },
+          isAuthenticated: true,
+        }),
+
+      clearAuth: () =>
+        set({
+          token: null,
+          user: null,
+          isAuthenticated: false,
+        }),
+
+      updateUser: (userData: Partial<User>) =>
+        set((state) => ({
+          user: state.user ? { ...state.user, ...userData } : null,
+        })),
+    }),
+    {
+      name: 'auth-storage',
+      partialize: (state) => ({
+        token: state.token,
+        user: state.user,
+        isAuthenticated: state.isAuthenticated,
+      }),
+    }
+  )
+)