Add Polar payments, WorkOS authentication, and Convex database integrations

[devin-ai-integration]

Add Polar Payments, WorkOS Authentication, and Convex Database Integration

Summary

This PR implements comprehensive integrations for the Fireplexity AI search engine:

• 🔐 WorkOS Authentication: User authentication system with sign-in/sign-out flows
• 💳 Polar Payments: Subscription system with Free ($0/month, 10 searches/day) and Pro ($9.99/month, unlimited) tiers
• 📊 Convex Database: User management, search history persistence, and subscription tracking
• 🎨 Landing Page: Complete marketing site with pricing, features, and call-to-action sections
• ⚙️ API Routes: Authentication endpoints, checkout flow, and webhook handlers

⚠️ IMPORTANT: Due to persistent WorkOS configuration issues during development, authentication is currently disabled with mock user data in place for local development. This requires immediate attention before production deployment.

Review & Testing Checklist for Human

• 🚨 CRITICAL: Remove hardcoded mock user data from /api/auth/me and /api/checkout routes and restore proper WorkOS authentication
• 🚨 CRITICAL: Test WorkOS authentication flow end-to-end (sign-in, sign-out, session management)
• 🔍 HIGH PRIORITY: Test Polar payment integration completely - create checkout sessions, process payments, handle webhooks
• 🔧 HIGH PRIORITY: Verify environment variables load properly in production environment (WorkOS cookie password errors occurred locally)
• ✅ MEDIUM: Test database operations with concurrent users and subscription limit enforcement

Recommended Test Plan:

1. Configure WorkOS properly and re-enable authentication middleware
2. Test complete user journey: sign-up → free tier usage → upgrade to pro → unlimited searches
3. Verify webhook handling for subscription changes
4. Test search history persistence across user sessions

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TB
    subgraph "Frontend"
        LP["app/page.tsx<br/>Landing Page"]:::major-edit
        DASH["app/dashboard/page.tsx<br/>Dashboard"]:::major-edit
        SEARCH["app/search/page.tsx<br/>Search Interface"]:::major-edit
    end
    
    subgraph "Authentication"
        MW["middleware.ts<br/>Auth Middleware"]:::major-edit
        AUTH_ME["app/api/auth/me/route.ts<br/>User Session"]:::major-edit
        PROVIDERS["components/providers.tsx<br/>Auth Provider"]:::major-edit
    end
    
    subgraph "Payments"
        CHECKOUT["app/api/checkout/route.ts<br/>Polar Checkout"]:::major-edit
        WEBHOOK["app/api/webhooks/polar/route.ts<br/>Subscription Events"]:::major-edit
    end
    
    subgraph "Database"
        USERS["convex/users.ts<br/>User Management"]:::major-edit
        SEARCHES["convex/searches.ts<br/>Search History"]:::major-edit
        SCHEMA["convex/schema.ts<br/>Database Schema"]:::major-edit
    end
    
    subgraph "Configuration"
        ENV[".env.local<br/>Environment Variables"]:::minor-edit
        LAYOUT["app/layout.tsx<br/>Root Layout"]:::minor-edit
    end

    LP --> AUTH_ME
    DASH --> USERS
    SEARCH --> SEARCHES
    MW --> AUTH_ME
    CHECKOUT --> WEBHOOK
    PROVIDERS --> USERS
    
    subgraph Legend
        L1["Major Edit"]:::major-edit
        L2["Minor Edit"]:::minor-edit
        L3["Context/No Edit"]:::context
    end

classDef major-edit fill:#90EE90
classDef minor-edit fill:#87CEEB  
classDef context fill:#FFFFFF

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Notes

• Session Reference: This work was completed in Devin session https://app.devin.ai/sessions/d68a50c188744f1abe1182a033c6913b
• Requested by: @developersdigest (developers.digest.ai@gmail.com)
• Authentication Status: Currently using mock data due to WorkOS configuration issues - requires immediate fix before production
• Payment Integration: Polar product created successfully but API compatibility needs verification
• Database Testing: Convex integration tested with concurrent operations and retry mechanisms
• Local Development: Both npx convex dev and npm run dev required to run the application

Screenshots:

[devin-ai-integration]

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