feat: implement IPC handlers, database services and Extractor UI

- Add SqlServerService and MySqlService for database persistence
- Implement IPC handlers for file, extractor, cleaner, and database operations
- Define IPC API types and update preload script
- Create ExtractorPage UI with OrderNumberInput component
- Add unit and integration tests for MySQL and SQL Server
- Update vitest config with path aliases

src/main/ipc/database-handler.ts

@@ -0,0 +1,181 @@
+import { ipcMain } from 'electron'
+import { MySqlService } from '../services/database/mysql'
+import { SqlServerService } from '../services/database/sql-server'
+import type {
+  MySqlConfig,
+  MySqlQueryResult,
+  SqlServerConfig,
+  SqlServerQueryResult
+} from '../types/ipc-api.types'
+
+// Store MySQL service instances per window/connection
+const mysqlServices = new Map<string, MySqlService>()
+
+// Store SQL Server service instances per window/connection
+const sqlServerServices = new Map<string, SqlServerService>()
+
+/**
+ * Get or create MySQL service for a connection ID
+ */
+function getMySqlService(connectionId: string): MySqlService | undefined {
+  return mysqlServices.get(connectionId)
+}
+
+/**
+ * Set MySQL service for a connection ID
+ */
+function setMySqlService(connectionId: string, service: MySqlService): void {
+  mysqlServices.set(connectionId, service)
+}
+
+/**
+ * Delete MySQL service for a connection ID
+ */
+function deleteMySqlService(connectionId: string): void {
+  mysqlServices.delete(connectionId)
+}
+
+/**
+ * Get or create SQL Server service for a connection ID
+ */
+function getSqlServerService(connectionId: string): SqlServerService | undefined {
+  return sqlServerServices.get(connectionId)
+}
+
+/**
+ * Set SQL Server service for a connection ID
+ */
+function setSqlServerService(connectionId: string, service: SqlServerService): void {
+  sqlServerServices.set(connectionId, service)
+}
+
+/**
+ * Delete SQL Server service for a connection ID
+ */
+function deleteSqlServerService(connectionId: string): void {
+  sqlServerServices.delete(connectionId)
+}
+
+/**
+ * Register IPC handlers for database operations
+ */
+export function registerDatabaseHandlers(): void {
+  // Connect to MySQL
+  ipcMain.handle('database:mysql:connect', async (event, config: MySqlConfig): Promise<void> => {
+    try {
+      // Use window ID as connection identifier
+      const windowId = (event.sender as any).id.toString()
+      const service = new MySqlService(config)
+      await service.connect()
+      setMySqlService(windowId, service)
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Failed to connect to MySQL'
+      throw new Error(message)
+    }
+  })
+
+  // Disconnect from MySQL
+  ipcMain.handle('database:mysql:disconnect', async (event): Promise<void> => {
+    try {
+      const windowId = (event.sender as any).id.toString()
+      const service = getMySqlService(windowId)
+      if (service) {
+        await service.disconnect()
+        deleteMySqlService(windowId)
+      }
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Failed to disconnect from MySQL'
+      throw new Error(message)
+    }
+  })
+
+  // Check if MySQL is connected
+  ipcMain.handle('database:mysql:isConnected', async (event): Promise<boolean> => {
+    const windowId = (event.sender as any).id.toString()
+    const service = getMySqlService(windowId)
+    return service ? service.isConnected() : false
+  })
+
+  // Execute MySQL query
+  ipcMain.handle(
+    'database:mysql:query',
+    async (event, sql: string, params?: any[]): Promise<MySqlQueryResult> => {
+      try {
+        const windowId = (event.sender as any).id.toString()
+        const service = getMySqlService(windowId)
+
+        if (!service) {
+          throw new Error('Not connected to MySQL. Call connect() first.')
+        }
+
+        return await service.query(sql, params)
+      } catch (error) {
+        const message = error instanceof Error ? error.message : 'MySQL query failed'
+        throw new Error(message)
+      }
+    }
+  )
+
+  // Connect to SQL Server
+  ipcMain.handle(
+    'database:sqlserver:connect',
+    async (event, config: SqlServerConfig): Promise<void> => {
+      try {
+        const windowId = (event.sender as any).id.toString()
+        const service = new SqlServerService(config)
+        await service.connect()
+        setSqlServerService(windowId, service)
+      } catch (error) {
+        const message = error instanceof Error ? error.message : 'Failed to connect to SQL Server'
+        throw new Error(message)
+      }
+    }
+  )
+
+  // Disconnect from SQL Server
+  ipcMain.handle('database:sqlserver:disconnect', async (event): Promise<void> => {
+    try {
+      const windowId = (event.sender as any).id.toString()
+      const service = getSqlServerService(windowId)
+      if (service) {
+        await service.disconnect()
+        deleteSqlServerService(windowId)
+      }
+    } catch (error) {
+      const message =
+        error instanceof Error ? error.message : 'Failed to disconnect from SQL Server'
+      throw new Error(message)
+    }
+  })
+
+  // Check if SQL Server is connected
+  ipcMain.handle('database:sqlserver:isConnected', async (event): Promise<boolean> => {
+    const windowId = (event.sender as any).id.toString()
+    const service = getSqlServerService(windowId)
+    return service ? service.isConnected() : false
+  })
+
+  // Execute SQL Server query
+  ipcMain.handle(
+    'database:sqlserver:query',
+    async (
+      event,
+      sqlString: string,
+      params?: Record<string, unknown>
+    ): Promise<SqlServerQueryResult> => {
+      try {
+        const windowId = (event.sender as any).id.toString()
+        const service = getSqlServerService(windowId)
+
+        if (!service) {
+          throw new Error('Not connected to SQL Server. Call connect() first.')
+        }
+
+        return await service.query(sqlString, params)
+      } catch (error) {
+        const message = error instanceof Error ? error.message : 'SQL Server query failed'
+        throw new Error(message)
+      }
+    }
+  )
+}