feat: AI-powered login page with daily greeting and animated blob background

- Add public /api/greeting endpoint that generates a daily AI greeting (cached per day)
- Replace static hero text with dynamic AI greeting (ChatGPT/Claude style)
- Add Stripe-style animated gradient blobs with 14 daily-rotating color palettes
- Use Plus Jakarta Sans font and Sparkles icon for modern AI look
- Update subtitle to "Driven by multiple AI agents"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Frontend/tailwind.config.ts

@@ -80,10 +80,22 @@ export default {
             height: "0",
           },
         },
+        blob: {
+          "0%, 100%": { transform: "translate(0, 0) scale(1)", borderRadius: "40% 60% 70% 30% / 40% 50% 60% 50%" },
+          "25%": { transform: "translate(80px, -60px) scale(1.25)", borderRadius: "60% 40% 30% 70% / 60% 30% 70% 40%" },
+          "50%": { transform: "translate(-50px, 50px) scale(0.85)", borderRadius: "30% 60% 40% 70% / 50% 60% 30% 60%" },
+          "75%": { transform: "translate(40px, 30px) scale(1.1)", borderRadius: "50% 40% 60% 30% / 40% 70% 50% 60%" },
+        },
+        "blob-spin": {
+          "0%": { transform: "rotate(0deg)" },
+          "100%": { transform: "rotate(360deg)" },
+        },
       },
       animation: {
         "accordion-down": "accordion-down 0.2s ease-out",
         "accordion-up": "accordion-up 0.2s ease-out",
+        blob: "blob 10s ease-in-out infinite",
+        "blob-spin": "blob-spin 20s linear infinite",
       },
     },
   },