fix: clean up root endpoint and disable redoc

- Simplify root endpoint to return minimal status info
- Remove obsolete endpoint listings (moved to /docs)
- Clean up verbose app description
- Disable redoc UI

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "core-api"
-version = "1.3.1"
+version = "1.3.2"
 description = "Core Code API - Infrastructure management and tools API"
 readme = "README.md"
 requires-python = ">=3.12"