chore: Fix trailing whitespace across project files

Automated fix from pre-commit hooks (trailing-whitespace, end-of-file-fixer).

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

MIRRORING-GUIDE.md

@@ -177,7 +177,7 @@ Developer A → Gitea ←→ GitHub ← Developer B
    @app.route('/github-webhook', methods=['POST'])
    def github_hook():
        # Trigger Gitea pull
-       subprocess.run(['curl', '-X', 'POST', 
+       subprocess.run(['curl', '-X', 'POST',
            'https://git.terraphim.cloud/api/v1/repos/terraphim/repo/mirror-sync'])
        return 'OK'
 
@@ -451,7 +451,7 @@ Document your mirroring strategy:
 
 ## Recommended Setup for Your Use Case
 
-**Primary: Gitea (self-hosted, private)**  
+**Primary: Gitea (self-hosted, private)**
 **Mirror: GitHub (backup, CI/CD)**
 
 1. Use **Method 2 (Push Mirror)** from Gitea to GitHub