fix: correct tool count (596), default English dashboard, clean up stale references

- Tool count corrected: 589→596 (was missing 4 OAuth + 4 system config tools)
- System tools: 17→24 (accurate count of @mcp.tool() functions)
- Dashboard defaults to English; Farsi only via ?lang=fa query param
- Updated across all files: README, CLAUDE.md, CONTRIBUTING, DOCKER_README,
  getting-started, CHANGELOG, endpoints config
- Removed remaining Phase references from server.py startup log
- Tests: 289 passing

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

core/templates/oauth/error.html

@@ -79,7 +79,7 @@
         <div class="mt-6 text-center" {% if lang == 'fa' %}dir="rtl"{% endif %}>
             <p class="text-xs text-gray-500 dark:text-gray-400">
                 {{ t.need_help }}
-                <a href="https://github.com/airano-ir/coolify-mcp-hub" class="text-purple-600 dark:text-purple-400 hover:underline">{{ t.documentation }}</a>
+                <a href="https://github.com/airano-ir/mcphub" class="text-purple-600 dark:text-purple-400 hover:underline">{{ t.documentation }}</a>
             </p>
         </div>
     </div>