📦 chore: bump @librechat/agents to v3.4.2 and npm audit (#14702)

* 📦 chore: bump `@librechat/agents` to version 3.4.2

* 📦 chore: bump `mermaid` to version 11.16.1 and update related dependencies

* 📦 chore: bump `js-yaml` to version 4.3.1 in package-lock and data-provider

* 📦 chore: bump `nanoid` to version 3.3.18 in package.json and package-lock.json across multiple packages

* 🔧 fix: Remove stray `api/tsconfig.json` breaking e2e `~` alias

An empty `api/tsconfig.json` was accidentally committed with the agents bump.
Playwright's require hook resolves path aliases from the nearest path-config,
checking `tsconfig.json` before `jsconfig.json` in each folder, so the empty
file shadowed `api/jsconfig.json` — the only place `"~/*": ["./*"]` is defined.

Every e2e spec that calls `cleanupUser` then failed on
`Cannot find module '~/cache/getLogStores'` from `api/models/index.js`.

- delete the stray file and gitignore it so tooling can't re-commit it
- register `module-alias` in `cleanupUser` so backend requires resolve
  regardless of which path-config Playwright happens to find

* 📦 chore: bump `@librechat/agents` to version 3.4.3 in package.json and package-lock.json

api/package.json

@@ -46,7 +46,7 @@
     "@azure/storage-blob": "^12.30.0",
     "@google/genai": "^2.8.0",
     "@keyv/redis": "^4.3.3",
-    "@librechat/agents": "^3.4.0",
+    "@librechat/agents": "^3.4.3",
     "@librechat/api": "*",
     "@librechat/data-schemas": "*",
     "@microsoft/microsoft-graph-client": "^3.0.7",
@@ -104,7 +104,7 @@
     "mongodb": "^6.14.2",
     "mongoose": "^8.24.1",
     "multer": "^2.2.0",
-    "nanoid": "^3.3.7",
+    "nanoid": "^3.3.18",
     "node-fetch": "^2.7.0",
     "nodemailer": "^9.0.1",
     "ollama": "^0.5.0",