Fix worker-only database architecture and Vue Proxy serialization

- Implement worker-only database access to eliminate double migrations
- Add parameter serialization in usePlatformService to prevent Capacitor "object could not be cloned" errors
- Fix infinite logging loop with circuit breaker in databaseUtil
- Use dynamic imports in WebPlatformService to prevent worker thread errors
- Add higher-level database methods (getContacts, getSettings) to composable
- Eliminate Vue Proxy objects through JSON serialization and Object.freeze protection

Resolves Proxy(Array) serialization failures and worker context conflicts across Web/Capacitor/Electron platforms.

electron/capacitor.config.json

@@ -16,6 +16,19 @@
 				]
 			}
 		},
+		"SplashScreen": {
+			"launchShowDuration": 3000,
+			"launchAutoHide": true,
+			"backgroundColor": "#ffffff",
+			"androidSplashResourceName": "splash",
+			"androidScaleType": "CENTER_CROP",
+			"showSpinner": false,
+			"androidSpinnerStyle": "large",
+			"iosSpinnerStyle": "small",
+			"spinnerColor": "#999999",
+			"splashFullScreen": true,
+			"splashImmersive": true
+		},
 		"CapacitorSQLite": {
 			"iosDatabaseLocation": "Library/CapacitorDatabase",
 			"iosIsEncryption": false,