chore: bump version to v2026.4.342 and add configurable AI max tokens}
- Bump version from v2026.4.341 to v2026.4.342 in package.json, README.md, and artifacts/cluster.md
- Increase default AI max_tokens from 4096 to 16384 in callGroqDirect
- Make max_tokens configurable via p3xrs.cfg.groqMaxTokens
- Add groqMaxTokens to set-groq-api-key handler for runtime and persisted config
- Expose groqMaxTokens in socket.io initial settings payload