feat: add template sanitization to remove API tokens from workflow templates

- Add TemplateSanitizer utility class for detecting and replacing API tokens
- Update template repository to automatically sanitize on save
- Add sanitize:templates command to clean existing templates
- Uses pattern matching to detect various API token formats
- Fixes GitHub push protection blocking database updates

Note: Database will be updated separately after code is deployed

🤖 Generated with Claude Code

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

package.json

@@ -38,6 +38,7 @@
     "test:tools-documentation": "node dist/scripts/test-tools-documentation.js",
     "test:mcp:update-partial": "node dist/scripts/test-mcp-n8n-update-partial.js",
     "test:update-partial:debug": "node dist/scripts/test-update-partial-debug.js",
+    "sanitize:templates": "node dist/scripts/sanitize-templates.js",
     "db:rebuild": "node dist/scripts/rebuild-database.js",
     "db:init": "node -e \"new (require('./dist/services/sqlite-storage-service').SQLiteStorageService)(); console.log('Database initialized')\"",
     "docs:rebuild": "ts-node src/scripts/rebuild-database.ts",