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/site_registry.py

@@ -94,15 +94,13 @@ class SiteRegistry:
 
         # Log alias conflicts if any
         if self.alias_conflicts:
-            self.logger.warning("=" * 50)
-            self.logger.warning("DUPLICATE ALIAS CONFLICTS DETECTED:")
+            self.logger.info("Duplicate alias conflicts detected:")
             for alias, full_ids in self.alias_conflicts.items():
                 winner = self.aliases.get(alias)
                 losers = [fid for fid in full_ids if fid != winner]
-                self.logger.warning(
+                self.logger.info(
                     f"  Alias '{alias}': {winner} (winner), {losers} (using full_id)"
                 )
-            self.logger.warning("=" * 50)
 
     # Reserved words that should NOT be interpreted as site IDs
     RESERVED_SITE_WORDS = {
@@ -206,7 +204,7 @@ class SiteRegistry:
                 if alias not in self.alias_conflicts:
                     self.alias_conflicts[alias] = [existing_full_id]
                 self.alias_conflicts[alias].append(full_id)
-                self.logger.warning(
+                self.logger.info(
                     f"Duplicate alias '{alias}': {full_id} conflicts with {existing_full_id}. "
                     f"{full_id} will use full_id for endpoint path."
                 )