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/interfaces/worker-messages.ts

@@ -0,0 +1,128 @@
+/**
+ * Worker Message Interface for Database Operations
+ *
+ * Defines the communication protocol between the main thread and the
+ * SQL worker thread for TimeSafari web platform.
+ *
+ * @author Matthew Raymer
+ * @version 1.0.0
+ * @since 2025-07-02
+ */
+
+import type { QueryExecResult } from "./database";
+
+/**
+ * Base interface for all worker messages
+ */
+interface BaseWorkerMessage {
+  id: string;
+  type: string;
+}
+
+/**
+ * Database query request message
+ */
+export interface QueryRequest extends BaseWorkerMessage {
+  type: "query";
+  sql: string;
+  params?: unknown[];
+}
+
+/**
+ * Database execution request message (INSERT, UPDATE, DELETE, etc.)
+ */
+export interface ExecRequest extends BaseWorkerMessage {
+  type: "exec";
+  sql: string;
+  params?: unknown[];
+}
+
+/**
+ * Database get one row request message
+ */
+export interface GetOneRowRequest extends BaseWorkerMessage {
+  type: "getOneRow";
+  sql: string;
+  params?: unknown[];
+}
+
+/**
+ * Database initialization request message
+ */
+export interface InitRequest extends BaseWorkerMessage {
+  type: "init";
+}
+
+/**
+ * Health check request message
+ */
+export interface PingRequest extends BaseWorkerMessage {
+  type: "ping";
+}
+
+/**
+ * Union type of all possible request messages
+ */
+export type WorkerRequest =
+  | QueryRequest
+  | ExecRequest
+  | GetOneRowRequest
+  | InitRequest
+  | PingRequest;
+
+/**
+ * Success response from worker
+ */
+export interface SuccessResponse extends BaseWorkerMessage {
+  type: "success";
+  data: unknown;
+}
+
+/**
+ * Error response from worker
+ */
+export interface ErrorResponse extends BaseWorkerMessage {
+  type: "error";
+  error: {
+    message: string;
+    stack?: string;
+  };
+}
+
+/**
+ * Initialization complete response
+ */
+export interface InitCompleteResponse extends BaseWorkerMessage {
+  type: "init-complete";
+}
+
+/**
+ * Ping response
+ */
+export interface PongResponse extends BaseWorkerMessage {
+  type: "pong";
+}
+
+/**
+ * Union type of all possible response messages
+ */
+export type WorkerResponse =
+  | SuccessResponse
+  | ErrorResponse
+  | InitCompleteResponse
+  | PongResponse;
+
+/**
+ * Query result type specifically for database queries
+ */
+export interface QueryResult {
+  result: QueryExecResult[];
+}
+
+/**
+ * Execution result type for database modifications
+ */
+export interface ExecResult {
+  changes: number;
+  lastId?: number;
+}