Production-ready improvements: security hardening, Redis sessions, retry logic, updated pricing

Changes:
- Removed hardcoded admin credentials (now requires env vars)
- Added Redis session storage with in-memory fallback
- Improved CORS configuration with warnings for development mode
- Added retry_with_backoff decorator for translation API calls
- Updated pricing: Starter=, Pro=, Business=
- Stripe price IDs now loaded from environment variables
- Added redis to requirements.txt
- Updated .env.example with all new configuration options
- Created COMPREHENSIVE_REVIEW_AND_PLAN.md with deployment roadmap
- Frontend: Updated pricing page, new UI components

frontend/package-lock.json

@@ -25,6 +25,7 @@
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "framer-motion": "^12.23.24",
+        "lightningcss-win32-x64-msvc": "^1.30.2",
         "lucide-react": "^0.555.0",
         "next": "16.0.6",
         "react": "19.2.0",
@@ -40,6 +41,7 @@
         "@types/react-dom": "^19",
         "eslint": "^9",
         "eslint-config-next": "16.0.6",
+        "lightningcss": "^1.30.2",
         "tailwindcss": "^4",
         "tw-animate-css": "^1.4.0",
         "typescript": "^5"
@@ -6087,9 +6089,7 @@
       "cpu": [
         "x64"
       ],
-      "dev": true,
       "license": "MPL-2.0",
-      "optional": true,
       "os": [
         "win32"
       ],