test: add unit tests for Analytics, Search, and Notifications modules
Add 15 test files with 45 test cases covering all untested handlers:
- Analytics: track-event, generate-report, update-market-index, get-heatmap, get-price-trend, get-market-report, get-district-stats
- Search: reindex-all, sync-listing, search-properties, geo-search, listing-approved event handler
- Notifications: send-notification, agent-verified listener, user-registered listener
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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