refactor: delete BaseFontStore and UnifiedFontStore — FontStore is the single implementation

src/entities/Font/model/store/index.ts

@@ -6,13 +6,6 @@
  * Single export point for the unified font store infrastructure.
  */
 
-// Primary store (unified)
-export {
-    createUnifiedFontStore,
-    type UnifiedFontStore,
-    unifiedFontStore,
-} from './unifiedFontStore/unifiedFontStore.svelte';
-
 // Applied fonts manager (CSS loading - unchanged)
 export { appliedFontsManager } from './appliedFontsStore/appliedFontsStore.svelte';