Refactor: Fully migrated to direct PostgreSQL, implemented Public API v1, fixed Vercel deployment conflicts, and updated documentation

package.json

@@ -13,8 +13,6 @@
     "@solana/web3.js": "^1.98.4",
     "@stripe/react-stripe-js": "^5.4.1",
     "@stripe/stripe-js": "^8.6.1",
-    "@supabase/ssr": "^0.8.0",
-    "@supabase/supabase-js": "^2.90.1",
     "bcryptjs": "^3.0.3",
     "bs58": "^6.0.0",
     "clsx": "^2.1.1",
@@ -43,7 +41,7 @@
     "@types/pg": "^8.18.0",
     "@types/react": "^19",
     "@types/react-dom": "^19",
-    "chai": "^6.2.2",
+    "chai": "^4.3.7",
     "eslint": "^9",
     "eslint-config-next": "16.1.1",
     "ethers": "^6.16.0",