chore: remove API local model dependencies

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/api/src/types/image-decoders.d.ts

@@ -1,8 +0,0 @@
-declare module 'pngjs' {
-  export class PNG {
-    width: number;
-    height: number;
-    data: Buffer;
-    parse(data: Buffer, callback: (err: Error | null) => void): void;
-  }
-}