Refactor offline-first architecture with IndexedDB

Improves dependency injection and service initialization for IndexedDB-based calendar application

Implements lazy initialization for IndexedDB
Fixes race conditions in async event handling
Adds proper dependency injection with registerType
Enhances sync manager and repository pattern

Key improvements:
- Lazy database initialization
- Proper service lifecycle management
- Improved network awareness for sync operations
- Cleaned up initialization logic in index.ts

src/repositories/ApiEventRepository.ts

@@ -1,4 +1,5 @@
 import { ICalendarEvent } from '../types/CalendarTypes';
+import { Configuration } from '../configurations/CalendarConfig';
 
 /**
  * ApiEventRepository
@@ -15,8 +16,8 @@ import { ICalendarEvent } from '../types/CalendarTypes';
 export class ApiEventRepository {
   private apiEndpoint: string;
 
-  constructor(apiEndpoint: string) {
-    this.apiEndpoint = apiEndpoint;
+  constructor(config: Configuration) {
+    this.apiEndpoint = config.apiEndpoint || '/api';
   }
 
   /**