docs/fix: Deploy-Kette fuer Svelte-Build dokumentiert + node_modules excludiert

- CLAUDE.md: npm run build als Schritt vor git push dokumentiert, Vite-Dev-Hinweis
- maintenance.py self-update: frontend/node_modules vom rsync ausgenommen

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

routers/maintenance.py

@@ -38,6 +38,7 @@ def self_update():
     cmd = (
         f"cd {shlex.quote(SOURCE_DIR)} && git pull --ff-only && "
         f"rsync -a --exclude=.git --exclude=.venv --exclude=__pycache__ --exclude='*.pyc' "
+        f"--exclude='frontend/node_modules' "
         f"{shlex.quote(SOURCE_DIR)}/ {shlex.quote(PROD_DIR)}/ && "
         f"sudo systemctl restart mission-control"
     )