feat: Add database migration tools and fix Electron integration

- Add comprehensive IndexedDB to SQLite migration service (1,397 lines)
- Create migration UI with progress tracking and validation (1,492 lines)
- Fix Electron TypeScript compilation and SQLite plugin issues
- Expand migration system with detailed documentation and error handling
- Add development guide and coding standards

Resolves: #electron-startup #database-migration #typescript-errors
Impact: Enables user-friendly database migration with full data verification

src/router/index.ts

@@ -147,6 +147,11 @@ const routes: Array<RouteRecordRaw> = [
     name: "logs",
     component: () => import("../views/LogView.vue"),
   },
+  {
+    path: "/database-migration",
+    name: "database-migration",
+    component: () => import("../views/DatabaseMigration.vue"),
+  },
   {
     path: "/new-activity",
     name: "new-activity",