🔄 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

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

client/package.json

@@ -136,6 +136,7 @@
     "babel-plugin-transform-import-meta": "^2.3.2",
     "babel-plugin-transform-vite-meta-env": "^1.0.3",
     "eslint-plugin-jest": "^28.11.0",
+    "fs-extra": "^11.3.2",
     "identity-obj-proxy": "^3.0.0",
     "jest": "^29.7.0",
     "jest-canvas-mock": "^2.5.2",