Remove AWS Amplify dependencies and configuration

- Remove amplify/ directory and amplify.yml configuration
- Remove aws-amplify, @aws-amplify/backend, and @aws-amplify/backend-cli dependencies
- Clean up .gitignore entries for Amplify artifacts
- Regenerate package-lock.json without Amplify packages
- Reduce dependency count by 2,038 packages
- Build time improved and bundle size optimized

package.json

@@ -39,7 +39,6 @@
     "@radix-ui/react-tabs": "^1.1.3",
     "@radix-ui/react-toast": "^1.2.6",
     "@radix-ui/react-tooltip": "^1.1.8",
-    "aws-amplify": "^6.15.1",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "date-fns": "^3.6.0",
@@ -61,8 +60,6 @@
     "zod": "^3.24.2"
   },
   "devDependencies": {
-    "@aws-amplify/backend": "^1.16.1",
-    "@aws-amplify/backend-cli": "^1.8.0",
     "@types/node": "^20",
     "@types/react": "^18",
     "@types/react-dom": "^18",