fix: resolve tsx and Flutter command issues

- Move tsx from devDependencies to dependencies for Vercel builds
- Add .vercelignore to prevent Vercel from auto-detecting Flutter
- Ensure all build dependencies are available during deployment

Author: aimuhire

mobile/.vercelignore

@@ -0,0 +1,13 @@
+# Ignore Flutter-specific files that Vercel shouldn't process
+pubspec.yaml
+pubspec.lock
+lib/
+test/
+android/
+ios/
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+analysis_options.yaml
+*.iml

package-lock.json

@@ -47,6 +47,7 @@
     "pino": "^8.17.2",
     "pino-pretty": "^10.3.1",
     "qs": "^6.11.2",
+    "tsx": "^4.6.2",
     "typescript": "^5.5.4",
     "url-parse": "^1.5.10"
   },
@@ -56,7 +57,6 @@
     "@typescript-eslint/parser": "^6.13.1",
     "eslint": "^8.54.0",
     "jest": "^29.7.0",
-    "ts-jest": "^29.1.1",
-    "tsx": "^4.6.2"
+    "ts-jest": "^29.1.1"
   }
 }