MeraGaon Mart App Development

I want to develop "MeraGaon Mart" (similar to SwasthGaon), a simple and fast mobile/web app for rural users.
It should allow villagers to:
- Search medicines or diseases (e.g., typing "fever" shows related medicines)
- Upload a prescription/photo for medicine orders
- Place orders directly without showing the medical store name
- Login via OTP (mobile number)
- See order confirmation and "My Orders" section
- Chat with medical store or support
- Receive WhatsApp/SMS notifications for order updates
- Delivery boy tracking and assignment
- Auto-generated PDF invoice
- Medical panel dashboard to manage stock, discounts, reports, delivery zones by pincode, and wallet system

The interface should support both English and Hindi, and work smoothly even on low internet (3G/4G).

Tech preference: React, Firebase, Node.js (or similar)
Deliverables: Fully working web demo + video walkthrough