Initial commit: n8n Strike API node

- Add Strike API credentials configuration
- Implement Strike node with 9 resources (Account, Balance, Currency Exchange, Deposit, Invoice, Payment, Payment Method, Payout, Rates)
- Add comprehensive operation descriptions for all resources
- Include CLAUDE.MD documentation
- Set up build configuration with TypeScript, ESLint, and Prettier

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

node_modules/undertaker/lib/helpers/metadata.js

@@ -0,0 +1,7 @@
+'use strict';
+
+// WeakMap for storing metadata
+var WM = require('es6-weak-map');
+var metadata = new WM();
+
+module.exports = metadata;