chore: remove Firestore-related implementations and example files

Deleted all Firestore augmentation, storage, sync implementations, and related type definitions. Removed the FirestoreSync example file as part of the cleanup for disabled Firestore functionality.

src/types/augmentations.ts

@@ -187,7 +187,7 @@ export namespace BrainyAugmentations {
 
   /**
    * Interface for Memory augmentations.
-   * These augmentations provide storage capabilities for data in different formats (e.g., fileSystem, in-memory, or firestore).
+   * These augmentations provide storage capabilities for data in different formats (e.g., fileSystem, in-memory).
    */
   export interface IMemoryAugmentation extends IAugmentation {
     /**

src/types/firebase-vector-search.d.ts

@@ -1,20 +0,0 @@
-// TEMPORARILY COMMENTED OUT: Firebase vector search type declarations
-/*
-declare module '@firebase/firestore-vector-search' {
-  interface VectorSearchOptions {
-    collection: any;
-    vectorField: string;
-    queryVector: number[];
-    limit: number;
-    distanceMeasure?: string;
-  }
-
-  interface VectorSearchResult {
-    id: string;
-    data: any;
-    distance?: number;
-  }
-
-  export function findNearest(options: VectorSearchOptions): Promise<VectorSearchResult[]>;
-}
-*/