feat: admin auth, charts, backend service layer, frontend improvements

[AAYUSH412]

Admin Panel:

• Fix .env.local syntax (VITE_API_URL was invalid JS expression)
• Implement api.js, foodService.js, orderService.js (were empty)
• Add AuthContext, ProtectedRoute, admin Login page
• Add 3 live recharts: Revenue, Orders by Status, Category
• Fix Navbar to show real admin name with working logout
• Fix Orders double /api/ URL bug + POST->PATCH status update
• Fix food image URLs (use ImageKit CDN, not localhost)
• Fix 'Cannot access handleFileSelection before initialization' crash
• Fix orders filter showing empty list with empty search term
• Add Pending status support across Orders page

Backend:

• Add isAdmin field to userModel
• Add POST /user/admin/login endpoint (rejects non-admin with 403)
• Add service layer (foodService, orderService, userService)
• Add error-handler, logger, rate-limit middleware
• Improve error handling across controllers

Frontend:

• Centralize API calls through api.js service
• Add 14 shadcn/ui components
• Fix ESLint errors (motion imports, smart quotes in Contact.jsx)
• Add useOrders custom hook
• Fix AddressesPage to use api.js instead of raw axios

Docs:

• Add DOCUMENTATION.md for admin, backend, frontend
• Add CHANGES.md summarizing all changes

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Pull request overview

This PR implements a comprehensive admin authentication system, adds data visualization charts to the dashboard, introduces a service layer to the backend for better code organization, and includes numerous bug fixes and improvements across the admin panel and frontend.

Changes:

• Added JWT-based admin authentication with login page, AuthContext, and protected routes
• Implemented three live Recharts visualizations (Revenue, Orders by Status, Category distribution)
• Created backend service layer (foodService, orderService, userService) and improved error handling
• Fixed multiple critical bugs including incorrect API URLs, image loading issues, and filter logic

Reviewed changes

Copilot reviewed 117 out of 275 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
frontend/.agents/skills/ui-ux-pro-max/data/stacks/astro.csv	Added Astro framework best practices guideline data
frontend/.agents/skills/ui-ux-pro-max/data/landing.csv	Added landing page design pattern reference data
frontend/.agents/skills/ui-ux-pro-max/data/charts.csv	Added chart type selection and accessibility guidelines
frontend/.agents/skills/shadcn-ui/references/learn.md	Added shadcn/ui learning guide documentation
frontend/.agents/skills/shadcn-ui/references/chart.md	Added shadcn/ui chart component reference
frontend/.agents/skills/find-skills/SKILL.md	Added skill discovery system documentation
backend/vercel.json	Removed hardcoded environment variables
backend/utils/errors.js	Created custom error classes for better error handling
backend/services/userService.js	Created user service layer with auth and profile logic
backend/services/orderService.js	Created order service layer with validation
backend/services/foodService.js	Created food service layer
backend/server.js	Added middleware for logging, rate limiting, and error handling
backend/scripts/makeAdmin.js	Created admin promotion script
backend/routes/userRoute.js	Added admin login endpoint
backend/models/userModel.js	Added isAdmin field to user schema
backend/middleware/*	Added error handler, logger, and rate limiter middleware
backend/controllers/*	Refactored to use service layer
admin/src/services/*	Implemented all API service methods
admin/src/contexts/AuthContext.jsx	Created admin authentication context
admin/src/components/ProtectedRoute.jsx	Created route protection component
admin/src/components/Navbar/Navbar.jsx	Fixed to show real admin name and working logout
admin/src/components/Charts/Charts.jsx	Created three chart components
admin/src/pages/Login/Login.jsx	Created admin login page
admin/src/pages/Orders/Orders.jsx	Fixed API calls and added Pending status support
admin/src/pages/List/List.jsx	Fixed image URLs to use ImageKit CDN
admin/src/pages/Add/Add.jsx	Fixed initialization order bug
admin/src/App.jsx	Added authentication routing
CHANGES.md	Added comprehensive change log

Files not reviewed (2)

• admin/package-lock.json: Language not supported
• backend/package-lock.json: Language not supported

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