WIP: Platform-specific service architecture and configuration refactor

This commit introduces a platform-specific service architecture and configuration
system, with the following changes:

- Created platform-specific service implementations for database backup:
  - Web: Uses URL.createObjectURL and download link
  - Mobile: Uses Capacitor Filesystem and Share APIs
  - Base: Abstract DatabaseBackupService class

- Implemented PlatformServiceFactory for dynamic service loading:
  - Singleton pattern for factory management
  - Dynamic imports based on platform environment
  - Error handling for service loading failures

- Refactored Vite configuration:
  - Split into base and platform-specific configs
  - Added environment-based platform detection
  - Improved build optimization settings

- Enhanced error handling:
  - Added type-safe error interfaces
  - Improved error message formatting
  - Better error logging with context

- Updated AccountViewView:
  - Moved profile management to ProfileSection component
  - Improved type safety in error handling
  - Enhanced database backup functionality

Note: This is a work in progress. Some features may need additional testing
and refinement before being production-ready.

.env.electron

@@ -0,0 +1 @@
+PLATFORM=electron