feat: implement user authentication system

- Add SessionManager for managing user sessions (singleton pattern)
- Add BIPUsersDAO for database authentication
- Add LoginDialog component for username/password login
- Add UserSelectionDialog component for admin user selection
- Support silent login by computer name
- Implement main page with navigation to Extractor and Cleaner

Database:
- Table: dbo_BIPUsers
- Fields: UserName, Password, UserType, ComputerNmae

UI Flow:
1. Silent login on startup via computer name
2. Show login dialog if silent login fails
3. Display main page with user info and navigation
4. Support logout and re-login

src/preload/index.d.ts

@@ -1,5 +1,13 @@
 import type { FileAPI, ExtractorAPI, CleanerAPI, DatabaseAPI } from '../main/types/ipc-api.types'
 import type { ResolverInput, ResolverResponse } from '../main/ipc/resolver-handler'
+import type { UserInfo } from '../main/types/user.types'
+import type {
+  LoginRequest,
+  LoginResponse,
+  SilentLoginResponse,
+  UserSelectionResponse,
+  CurrentUserResponse
+} from '../main/ipc/auth-handler'
 
 /**
  * Order number resolver API
@@ -21,6 +29,46 @@ export interface ResolverAPI {
   }>
 }
 
+/**
+ * Authentication API
+ */
+export interface AuthAPI {
+  /**
+   * Get computer name
+   */
+  getComputerName: () => Promise<string>
+  /**
+   * Silent login by computer name
+   */
+  silentLogin: () => Promise<SilentLoginResponse>
+  /**
+   * Login with username and password
+   * @param request - Login request with username and password
+   */
+  login: (request: LoginRequest) => Promise<LoginResponse>
+  /**
+   * Logout
+   */
+  logout: () => Promise<void>
+  /**
+   * Get current user
+   */
+  getCurrentUser: () => Promise<CurrentUserResponse>
+  /**
+   * Get all users (for admin user selection)
+   */
+  getAllUsers: () => Promise<UserInfo[]>
+  /**
+   * Switch user (admin only)
+   * @param userInfo - User info to switch to
+   */
+  switchUser: (userInfo: UserInfo) => Promise<UserSelectionResponse>
+  /**
+   * Check if current user is admin
+   */
+  isAdmin: () => Promise<boolean>
+}
+
 declare global {
   interface Window {
     electron: {
@@ -44,6 +92,7 @@ declare global {
       cleaner: CleanerAPI
       database: DatabaseAPI
       resolver: ResolverAPI
+      auth: AuthAPI
     }
     api: unknown
   }