🔄 refactor: Migrate Cache Logic to TypeScript (#9771)

* Refactor: Moved Redis cache infra logic into `packages/api`
- Moved cacheFactory and redisClients from `api/cache` into `packages/api/src/cache` so that features in `packages/api` can use cache without importing backward from the backend.
- Converted all moved files into TS with proper typing.
- Created integration tests to run against actual Redis servers for redisClients and cacheFactory.
- Added a GitHub workflow to run integration tests for the cache feature.
- Bug fix: keyvRedisClient now implements the PING feature properly.

* chore: consolidate imports in getLogStores.js

* chore: reorder imports

* chore: re-add fs-extra as dev dep.

* chore: reorder imports in cacheConfig.ts, cacheFactory.ts, and keyvMongo.ts

---------

Co-authored-by: Danny Avila <danny@librechat.ai>

packages/api/src/index.ts

@@ -35,6 +35,8 @@ export * from './files';
 export * from './tools';
 /* web search */
 export * from './web';
+/* Cache */
+export * from './cache';
 /* types */
 export type * from './mcp/types';
 export type * from './flow/types';