Implement Upstash Redis rate-limiters for all endpoints

[thekavishshah]

Auth Sign-in (POST /api/auth/signin): 5 requests/min

Forgot-password (POST /api/auth/forgot-password): 5 requests/hr

Session (GET /api/auth/session): 30 requests/min

Deals Read (GET /api/deals):* 50 requests/min

Deals Create (POST /api/deals): 10 requests/min

Deals Update (PATCH /api/deals/:id): 20 requests/min

Deals Delete (DELETE /api/deals/:id): 5 requests/min

Status Toggle (POST /api/deals/:id/status): 30 requests/min

Search (GET /api/search): 50 requests/min

AI Analyze (POST /api/ai/analyze): 5 requests/min

File Upload (POST /api/upload): 10 requests/hr

Comments (POST /api/deals/:id/comment): 50 requests/min

Notifications (GET /api/notifications): 30 requests/min

Admin Actions (POST /api/admin/*): 5 requests/min

Global Fallback (any other route): 50 requests/min

[vercel]

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