feat(traffic-flow): add rebuild facts endpoint and enhance traffic flow analytics

- Introduced a new endpoint `/traffic/flow/rebuild-facts` to rebuild flow facts from buckets, improving data accuracy and management.
- Updated traffic flow analytics to utilize the new `resolveInternetDest` function for better destination resolution.
- Enhanced tests for traffic flow IP handling and added new utility functions for managing internet destinations.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/scripts/rebuild-flow-facts.ts

@@ -0,0 +1,8 @@
+import { initDatabase } from "../db/bootstrap.js"
+import { closePool } from "../db/index.js"
+import { rebuildFlowFactsFromBuckets } from "../services/traffic-flow-facts-rebuild.js"
+
+await initDatabase()
+const result = await rebuildFlowFactsFromBuckets()
+console.log(JSON.stringify(result, null, 2))
+await closePool()