fix(qa): resolve A.1-A.7 code bugs and B.1-B.8 documentation issues

Code fixes:
- Rename "Coolify Admin" to "MCP Hub Admin" in endpoints
- Enrich list_projects with alias and endpoint URL
- Downgrade OAuth InvalidTokenError log from WARNING to DEBUG
- Add 7 missing health tools to /system/mcp endpoint (now 24 tools)
- Remove "Phase 7.2" from health monitor log
- Fix WP Advanced health check to pass with REST API only
- Downgrade duplicate alias warnings to INFO

Documentation fixes:
- Document SSE transport and Bearer auth requirement
- Recommend plugin-specific endpoints to save tokens
- Document plugin vs project endpoint differences
- WordPress plugin requirements for SEO/WP-CLI tools
- Docker socket mounting guide for WP-CLI
- Mark MASTER_API_KEY as recommended (auto-generates temp key)
- Env var naming convention with prefix table

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/oauth/token_manager.py

@@ -139,7 +139,7 @@ class TokenManager:
             logger.warning("Expired access token")
             raise
         except jwt.InvalidTokenError as e:
-            logger.warning(f"Invalid access token: {e}")
+            logger.debug(f"Invalid access token: {e}")
             raise
 
     def generate_refresh_token(self, client_id: str, access_token: str) -> str: