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.

src/services/PlatformService.ts

@@ -130,4 +130,15 @@ export interface PlatformService {
     sql: string,
     params?: unknown[],
   ): Promise<{ changes: number; lastId?: number }>;
+
+  /**
+   * Executes a SQL query and returns the first row as an array.
+   * @param sql - The SQL query to execute
+   * @param params - The parameters to pass to the query
+   * @returns Promise resolving to the first row as an array, or undefined if no results
+   */
+  dbGetOneRow(
+    sql: string,
+    params?: unknown[],
+  ): Promise<unknown[] | undefined>;
 }