chore: remove internal docs map + sync prompt; add docs CI

[gtupak]

This pull request restructures the documentation synchronization workflow for the Mintlify docs repository. The changes include:

1. Removed internal documentation code map (DOCS_CODE_MAP.md): Deleted a detailed reference document that mapped documentation areas to corresponding code paths in the routemesh monorepo (atlas, sentinel, front-end).

2. Removed documentation sync prompt (PROMPT_DOCS_SYNC.md): Deleted an AI-oriented prompt document that guided automated verification of documentation accuracy against the codebase, including checks for error codes, provider portal URLs, external links, and OpenAPI consistency.

3. Added documentation CI workflow (.github/workflows/docs-ci.yaml): Created a new GitHub Actions workflow that:

   • Runs on pull requests and pushes to main/master branches
   • Sets up Node.js 20 with npm caching
   • Installs dependencies
   • Validates the Mintlify configuration using npx mintlify validate
   • Checks for broken links using npx mintlify broken-links
   • Includes concurrency controls to cancel in-progress runs for the same branch

The overall change moves away from manual/internal documentation sync references toward automated CI-based validation of documentation quality and link integrity.

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