BlogGen Connector v1.1.8 — Token Rotation + Endpoint Security Hardening

- Stores connector tokens as password hashes.
- Adds token rotation and Hub access revocation.
- Adds secure endpoint request logging.
- Adds rate limiting for secure endpoints and failed authentication.
- Adds optional Hub hostname/IP allowlist.
- Keeps encrypted Meta tokens, IndexNow/Bing submission, and Hub-managed update support.
