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>

tests/conftest.py

@@ -0,0 +1,50 @@
+"""Pytest configuration and fixtures"""
+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from app.main import app
+from app.core.database import Base, get_db
+
+
+# Test database (in-memory SQLite)
+SQLALCHEMY_DATABASE_URL = "sqlite:///:memory:"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+@pytest.fixture(scope="function")
+def test_db():
+    """Create test database tables"""
+    Base.metadata.create_all(bind=engine)
+    yield
+    Base.metadata.drop_all(bind=engine)
+
+
+@pytest.fixture(scope="function")
+def db_session(test_db):
+    """Get test database session"""
+    session = TestingSessionLocal()
+    try:
+        yield session
+    finally:
+        session.close()
+
+
+@pytest.fixture(scope="function")
+def client(test_db):
+    """Get test client with overridden database"""
+
+    def override_get_db():
+        try:
+            db = TestingSessionLocal()
+            yield db
+        finally:
+            db.close()
+
+    app.dependency_overrides[get_db] = override_get_db
+    yield TestClient(app)
+    app.dependency_overrides.clear()