feat(fonts): implement Phase 6 - Cleanup and Removal

- Deleted src/entities/Font/model/store/googleFontsStore.svelte.ts
- Deleted src/entities/Font/model/store/fontshareStore.svelte.ts
- Deleted src/entities/Font/model/services/fetchGoogleFonts.svelte.ts
- Deleted src/entities/Font/model/services/fetchFontshareFonts.svelte.ts
- Deleted src/entities/Font/model/services/index.ts
- Updated Font entity exports to remove deprecated stores
- Updated model index exports to remove deprecated services
- Updated store index to only export unified store

Phase 6/7: Proxy API Integration for GlyphDiff

src/entities/Font/index.ts

@@ -55,7 +55,6 @@ export type {
     FontshareFont,
     FontshareLink,
     FontsharePublisher,
-    FontshareStore,
     FontshareStyle,
     FontshareStyleProperties,
     FontshareTag,
@@ -75,21 +74,10 @@ export type {
 export {
     appliedFontsManager,
     createUnifiedFontStore,
-    fetchFontshareFontsQuery,
     selectedFontsStore,
     unifiedFontStore,
 } from './model';
 
-// Stores (DEPRECATED)
-export {
-    createFontshareStore,
-    fontshareStore,
-} from './model';
-export {
-    createGoogleFontsStore,
-    GoogleFontsStore,
-} from './model/services/fetchGoogleFonts.svelte';
-
 // UI elements
 export {
     FontApplicator,