feat: implement product deletion and invalidate dashboard stats query

[Nareshkumawat-star]

📌 Linked Issue

Closes #240

📝 Summary of Changes

• Implemented deleteProduct in MongoStorage to clear products and all their dependencies (comments, reviews, owners, events, transfers, scans, notifications) in MongoDB.
• Created the secure DELETE /api/products/:id API route protecting it so that only the product owner or an admin user can delete the product.
• Implemented useDeleteProduct mutation hook in frontend to invalidate the ["/api/stats"] and ["/api/products"] query cache upon success.
• Updated StatsOverview to show the system-wide stats (including the "Total Products" stat card) for admin users instead of user-specific cards.
• Added a styled, destructive Delete button with a confirmation dialog on registered-products.tsx for owners and admins, and allowed admins to view all registered products.
• Updated setup.ts and wrote integration tests in rbac.test.ts to verify product deletion security rules for all user roles.

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🔧 Type of Change

• 🐛 Bug fix
• ✨ New feature / enhancement
• 🧹 Refactor / code cleanup
• 📄 Documentation update
• 🧪 Test addition or update
• ⚙️ Configuration / tooling change

---

🧪 Testing Steps

1. Run the backend integration test suite locally to verify authentication and RBAC for product deletion:

   npm run test

Log in as an admin or farmer, note the stats on the dashboard, navigate to the registered products page, delete a product, and return to verify that the "Total Products" stat card updates instantly without a manual page refresh.
Environment tested on:

OS: Windows
Node version: v24.11.0
🎥 Demo
✅ Checklist
My code follows the project's coding style and conventions
I have tested my changes locally (npm install + npm run dev)
I have linked the relevant issue above
I have not introduced any new linting errors or warnings
I have updated documentation if needed
My branch is up to date with main
🌟 GSSoC Declaration
This PR is submitted under GSSoC 2026
I have read and followed the

Contributing Guidelines
I have not plagiarised any content
This is my original work

[aditiraj2006]

📌 Linked Issue

Closes #240

📝 Summary of Changes

• Implemented deleteProduct in MongoStorage to clear products and all their dependencies (comments, reviews, owners, events, transfers, scans, notifications) in MongoDB.
• Created the secure DELETE /api/products/:id API route protecting it so that only the product owner or an admin user can delete the product.
• Implemented useDeleteProduct mutation hook in frontend to invalidate the ["/api/stats"] and ["/api/products"] query cache upon success.
• Updated StatsOverview to show the system-wide stats (including the "Total Products" stat card) for admin users instead of user-specific cards.
• Added a styled, destructive Delete button with a confirmation dialog on registered-products.tsx for owners and admins, and allowed admins to view all registered products.
• Updated setup.ts and wrote integration tests in rbac.test.ts to verify product deletion security rules for all user roles.

🔧 Type of Change

• 🐛 Bug fix
• ✨ New feature / enhancement
• 🧹 Refactor / code cleanup
• 📄 Documentation update
• 🧪 Test addition or update
• ⚙️ Configuration / tooling change

🧪 Testing Steps

1. Run the backend integration test suite locally to verify authentication and RBAC for product deletion:

   npm run test

Log in as an admin or farmer, note the stats on the dashboard, navigate to the registered products page, delete a product, and return to verify that the "Total Products" stat card updates instantly without a manual page refresh. Environment tested on:

OS: Windows Node version: v24.11.0 🎥 Demo ✅ Checklist My code follows the project's coding style and conventions I have tested my changes locally (npm install + npm run dev) I have linked the relevant issue above I have not introduced any new linting errors or warnings I have updated documentation if needed My branch is up to date with main 🌟 GSSoC Declaration This PR is submitted under GSSoC 2026 I have read and followed the

Contributing Guidelines I have not plagiarised any content This is my original work

u have conflicts resolve them and also how can u assign a user mail as an admin also add instruction for this also and if possible add screen recording of your work