docs: add architecture and module design specification for the supplier portal

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# Supplier Portal Architecture & Module Design
This document outlines the proposed module structure, page flows, and visual architecture for the E-Commerce Supplier Portal.
## 1. System Architecture & Modules
```mermaid
graph TD
%% Styling
classDef primary fill:#1A2B45,stroke:#1A2B45,color:#fff;
classDef accent fill:#E9C46A,stroke:#E9C46A,color:#1A2B45;
classDef container fill:#FFFFFF,stroke:#1A2B45,color:#1A2B45;
classDef bg fill:#F5F0EA,stroke:#1A2B45,color:#1A2B45;
%% Modules
AuthModule["Authentication Module"]:::primary
ProfileModule["Onboarding & Profile Module"]:::primary
ProductModule["Product Management"]:::primary
DashboardModule["Analytics & Dashboard"]:::primary
FulfillmentModule["Order & Fulfillment Tracking"]:::primary
WalletModule["Payout & Wallet"]:::primary
NotificationModule["Notification System"]:::primary
%% Components
Signup["Signup Page<br/>(Email, Phone, GSTIN Init)"]:::container
Login["Login Page<br/>(OTP / Password)"]:::container
ProfileComplete["Profile Completion Page<br/>(Store Info, Pickup Address, GSTIN Verify)"]:::container
ProdUpload["Single Upload / Modify Page"]:::container
BulkUpload["Bulk Excel/CSV Upload Page"]:::container
AnalyticsDash["Sales & Earnings Analytics<br/>(Yearly, Weekly, Daily, Custom Date Filters)"]:::container
StockReports["Stock & Inventory Tracking"]:::container
ReturnsDashboard["Customer Returns Center<br/>(Requests, Tracking & Quality Checks)"]:::container
PayoutCenter["Payout / Wallet Dashboard<br/>(Outstanding Balance, Withdrawal Request)"]:::container
ItemTracking["Item Tracking Dashboard<br/>(Individual Item Status, SKUs, Serials)"]:::container
TransitTracking["Transit Tracking Dashboard<br/>(Courier Status, Carrier Integration)"]:::container
%% Relations
AuthModule --> Signup
AuthModule --> Login
Signup --> ProfileComplete
ProfileComplete --> ProfileModule
ProductModule --> ProdUpload
ProductModule --> BulkUpload
DashboardModule --> AnalyticsDash
DashboardModule --> StockReports
FulfillmentModule --> ItemTracking
FulfillmentModule --> TransitTracking
FulfillmentModule --> ReturnsDashboard
WalletModule --> PayoutCenter
```
---
## 2. Detailed Page & Module Breakdown
### A. Authentication & Onboarding Module
1. **Signup Page**
- Business Email, Password, and Mobile Number validation.
- Initial GSTIN input (for verification).
2. **Login Page**
- Credentials or OTP-based secure login.
3. **Account Profile Completion Page (Onboarding Step 2)**
- **Store Details**: Upload Store Logo/Profile Image, Store Display Name.
- **Pickup & Shipping**: Pickup Address, contact person details.
- **Regulatory Info**: Verified GSTIN, Bank Account details (for payouts).
### B. Product & Inventory Management Module
1. **Single Product Upload & Modification**
- Form-based creation (Images, Title, Description, SKU, Category, Price, Stock count).
- Real-time preview of the product card matching our theme.
2. **Bulk Product Upload & Modify**
- Excel/CSV upload template download.
- Status log showing validation warnings (e.g., missing images, pricing errors).
### C. Analytical Dashboard Module
Provides comprehensive reporting with dynamic period filters (**Yearly, Weekly, Daily, and Custom Date Range**):
1. **Sales & Earnings Reports**
- Interactive charts showing Total Sales (Gross volume) vs. Total Earned (Net margin after commissions).
2. **Stock & Inventory Status**
- Low-stock alerts, active listings count, and inactive listings.
### D. Order & Fulfillment Tracking Module
1. **Item Tracking**
- Track individual items per order (SKU details, quantity, individual packaging status).
- Flag items: *Ready to Ship*, *Shipped*, *Delivered*, *Cancelled*.
2. **Transit Tracking**
- Real-time logistic carrier updates (e.g., DHL, FedEx, Local Post tracking number integration).
- Expected Delivery Date and transit milestones display.
3. **Return Tracking & Return Requests**
- **Items Requested for Return**: Lists customer return requests, reason for return, and custom images uploaded by the customer (e.g., defective product, wrong size). Action to *Approve* or *Reject* return.
- **In-Transit Return Tracking**: Real-time logistic progress of returning items from the customer back to the supplier hub.
### E. Wallet & Financials (Payout) Module
1. **Current Outstanding Balance**
- Live ready-to-withdraw funds display.
2. **Withdrawal Interface**
- Payout history list with status tracking (Pending, Approved, Transferred).
- "Withdraw Funds" action trigger.
### F. Notifications & Account Settings
1. **Header Notification Drawer**
- Real-time notices for new orders, low inventory, return requests, and completed payouts.
2. **Profile / Account Settings Page**
- Modify existing Store Profile Image, Pickup Location details, and GSTIN certificates.