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Phase 5: Advanced Features

- Code generation engine (cURL, Python, JavaScript, Node.js) with CodeGenerator modal
- Code button in request builder URL bar for instant snippet generation
- Enhanced History page with server-backed pagination, clickable detail modal, replay, and export
- RequestDetailModal with full request/response viewer, headers, replay action
- Enhanced Collection Runner with iteration count, delay between requests, environment variable injection, progress bar, and stop button
- Import/Export panel supporting API-Watch collections, environments, full backup, and Postman v2.1 import
- Import/Export wired into CollectionsSidebar with ArrowUpDown button
- 26 new code generator tests (162 frontend total, 172 backend — all passing)