feat: implement settings interface with user permission control

New Features:
- Add SettingsPage component with Admin/User view differentiation
- Create ConfigManager service for .env file management
- Add IPC handlers for settings CRUD operations
- Implement connection testing for ERP and database
- Add settings navigation to main app

Files Created:
- src/main/types/settings.types.ts - Type definitions
- src/main/services/config/config-manager.ts - Config service
- src/main/ipc/settings-handler.ts - IPC handlers
- src/renderer/src/pages/SettingsPage.tsx - React UI component

Files Modified:
- src/main/ipc/index.ts - Register settings handlers
- src/preload/index.ts - Expose settings API
- src/preload/index.d.ts - Add SettingsAPI type
- src/renderer/src/App.tsx - Add settings navigation

Co-Authored-By: Claude (qwen3.5-plus) <noreply@anthropic.com>

src/main/types/settings.types.ts

@@ -0,0 +1,185 @@
+/**
+ * Settings types and interfaces
+ *
+ * Defines configuration structures for ERPAuto settings management
+ */
+
+/**
+ * User type for settings permission control
+ */
+export type UserType = 'Admin' | 'User' | 'Guest'
+
+/**
+ * Database type selection
+ */
+export type DatabaseType = 'sqlserver' | 'mysql'
+
+/**
+ * Validation match mode
+ */
+export type MatchMode = 'substring' | 'exact'
+
+/**
+ * Validation data source options
+ */
+export type ValidationDataSource = 'database_full' | 'database_filtered' | 'excel_existing' | 'excel_full'
+
+/**
+ * ERP configuration
+ */
+export interface ErpConfig {
+  /** ERP system URL */
+  url: string
+  /** ERP username */
+  username: string
+  /** ERP password */
+  password: string
+  /** Headless browser mode */
+  headless: boolean
+  /** Ignore HTTPS certificate errors */
+  ignoreHttpsErrors: boolean
+  /** Auto close browser after operations */
+  autoCloseBrowser: boolean
+}
+
+/**
+ * Database configuration
+ */
+export interface DatabaseConfig {
+  /** Database type */
+  dbType: DatabaseType
+  /** SQL Server server address */
+  server: string
+  /** MySQL host */
+  mysqlHost: string
+  /** MySQL port */
+  mysqlPort: number
+  /** Database name */
+  database: string
+  /** Database username */
+  username: string
+  /** Database password */
+  password: string
+}
+
+/**
+ * Path configuration
+ */
+export interface PathsConfig {
+  /** Data directory */
+  dataDir: string
+  /** Default output file */
+  defaultOutput: string
+  /** Validation output file */
+  validationOutput: string
+}
+
+/**
+ * Data extraction configuration
+ */
+export interface ExtractionConfig {
+  /** Batch size for data extraction */
+  batchSize: number
+  /** Enable verbose logging */
+  verbose: boolean
+  /** Auto convert to Excel */
+  autoConvert: boolean
+  /** Merge batches */
+  mergeBatches: boolean
+  /** Enable database persistence */
+  enableDbPersistence: boolean
+}
+
+/**
+ * Material validation configuration
+ */
+export interface ValidationConfig {
+  /** Data source type */
+  dataSource: ValidationDataSource
+  /** Batch size for validation */
+  batchSize: number
+  /** Match mode */
+  matchMode: MatchMode
+  /** Enable CRUD operations */
+  enableCrud: boolean
+  /** Default manager name */
+  defaultManager: string
+}
+
+/**
+ * UI configuration
+ */
+export interface UiConfig {
+  /** Font family */
+  fontFamily: string
+  /** Font size */
+  fontSize: number
+  /** Production ID input width */
+  productionIdInputWidth: number
+}
+
+/**
+ * Execution configuration (User-only)
+ */
+export interface ExecutionConfig {
+  /** Dry run mode */
+  dryRun: boolean
+}
+
+/**
+ * Complete settings data structure
+ */
+export interface SettingsData {
+  /** ERP configuration */
+  erp: ErpConfig
+  /** Database configuration */
+  database: DatabaseConfig
+  /** Path configuration */
+  paths: PathsConfig
+  /** Extraction configuration */
+  extraction: ExtractionConfig
+  /** Validation configuration */
+  validation: ValidationConfig
+  /** UI configuration */
+  ui: UiConfig
+  /** Execution configuration */
+  execution: ExecutionConfig
+}
+
+/**
+ * Connection test result
+ */
+export interface ConnectionTestResult {
+  /** Whether connection was successful */
+  success: boolean
+  /** Status message */
+  message?: string
+}
+
+/**
+ * Save settings result
+ */
+export interface SaveSettingsResult {
+  /** Whether save was successful */
+  success: boolean
+  /** Error message if failed */
+  error?: string
+}
+
+/**
+ * Settings API interface for preload
+ */
+export interface SettingsAPI {
+  /** Get current user type */
+  getUserType: () => Promise<UserType>
+  /** Get settings (filtered by user type) */
+  getSettings: () => Promise<SettingsData>
+  /** Save settings */
+  saveSettings: (settings: SettingsData) => Promise<SaveSettingsResult>
+  /** Reset to defaults (Admin only) */
+  resetDefaults: () => Promise<SaveSettingsResult>
+  /** Test ERP connection */
+  testErpConnection: () => Promise<ConnectionTestResult>
+  /** Test database connection */
+  testDbConnection: () => Promise<ConnectionTestResult>
+}