feat: add Swagger UI docs, custom CORS middleware, and request logging

- Add Swagger UI files and updated API spec for Family Safety Tracker
- Replace shelf_cors_headers with custom CORS middleware in server.dart
- Add request_logger middleware with timing for auth and geo routes
- Add REGISTRATION_SECRET_KEY to .env for registration validation
- Remove postgres port exposure from docker-compose.yml
- Update opencode.json model configuration
- Add crypto dependency and update Flutter web assets

web/flutter_bootstrap.js

@@ -38,6 +38,6 @@ _flutter.buildConfig = {"engineRevision":"13e658725ddaa270601426d1485636157e38c3
 
 _flutter.loader.load({
   serviceWorkerSettings: {
-    serviceWorkerVersion: "240864774"
+    serviceWorkerVersion: "3111892966"
   }
 });