Implement Shop Insights App structure with Flutter frontend and Python backend

[Copilot]

Creates complete application structure for a vendor analytics platform with AI-powered insights. Implements 30 files across 10 directories following clean architecture patterns.

Frontend (Flutter/Dart)

• Architecture: Repository pattern with dummy, Firebase, and API implementations
• Screens: Login, dashboard with analytics charts, sales entry, OCR scanning, AI insights
• Models: Type-safe models with JSON serialization for sales, users, dashboard summaries
• Widgets: Reusable chart components (line/bar), product lists, insight cards using fl_chart
• Services: Dashboard aggregation, ML Kit OCR, Firebase authentication

Backend (Python/FastAPI)

• AI Integration: Google Gemini service for business insights, predictions, trend analysis
• API: RESTful endpoints for insights generation
• Security: JWT authentication middleware, environment-configurable CORS

Security Fixes

Updated vulnerable dependencies to patched versions:

• fastapi: 0.104.1 → 0.109.1 (fixes Content-Type ReDoS)
• python-multipart: 0.0.6 → 0.0.22 (fixes arbitrary file write, DoS, ReDoS vulnerabilities)

Implementation Notes

• Date filtering includes boundary timestamps (isAtSameMomentAs)
• Receipt parsing uses restrictive regex requiring decimal points or currency symbols to avoid false matches on quantities/line numbers
• CORS origins configurable via ALLOWED_ORIGINS environment variable

// Repository pattern allows swapping implementations
abstract class SalesRepository {
  Future<List<SaleModel>> getAllSales();
  Future<void> addSale(SaleModel sale);
}

// Use dummy data for development
final repo = DummySalesRepository();
// Or Firebase for production
final repo = FirebaseSalesRepository(userId: uid);

Original prompt

shop_insights_app/
│
├── lib/
│ ├── main.dart
│ │
│ ├── core/
│ │ ├── constants.dart
│ │ └── app_router.dart
│ │
│ ├── models/
│ │ ├── sale_model.dart
│ │ ├── dashboard_summary.dart
│ │ └── user_model.dart
│ │
│ ├── repositories/
│ │ ├── sales_repository.dart
│ │ ├── dummy_sales_repository.dart
│ │ ├── firebase_sales_repository.dart
│ │ ├── insights_repository.dart
│ │ ├── dummy_insights_repository.dart
│ │ └── api_insights_repository.dart
│ │
│ ├── services/
│ │ ├── dashboard_service.dart
│ │ ├── ocr_service.dart
│ │ └── auth_service.dart
│ │
│ ├── screens/
│ │ ├── login_screen.dart
│ │ ├── dashboard_screen.dart
│ │ ├── add_sale_screen.dart
│ │ ├── ocr_screen.dart
│ │ └── ai_insight_screen.dart
│ │
│ ├── widgets/
│ │ ├── sales_chart.dart
│ │ ├── category_bar_chart.dart
│ │ ├── top_products_list.dart
│ │ └── insight_card.dart
│ │
│ └── utils/
│ └── parsers.dart
│
├── backend/
│ ├── main.py (or index.js)
│ ├── gemini_service.py
│ ├── auth_middleware.py
│ └── requirements.txt
│
└── README.md this should be the file and folder arrangement

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