feat: Add Hardhat config, MockERC20 and tests for Smart Contract

package.json

@@ -15,7 +15,6 @@
     "@supabase/supabase-js": "^2.90.1",
     "clsx": "^2.1.1",
     "date-fns": "^4.1.0",
-    "ethers": "^6.13.5",
     "lucide-react": "^0.562.0",
     "next": "16.1.1",
     "react": "19.2.3",
@@ -25,12 +24,20 @@
     "tailwind-merge": "^3.4.0"
   },
   "devDependencies": {
+    "@nomicfoundation/hardhat-ethers": "^4.0.6",
+    "@nomicfoundation/hardhat-toolbox": "^6.1.2",
+    "@openzeppelin/contracts": "^5.6.1",
     "@tailwindcss/postcss": "^4",
+    "@types/chai": "^5.2.3",
+    "@types/mocha": "^10.0.10",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
+    "chai": "^6.2.2",
     "eslint": "^9",
     "eslint-config-next": "16.1.1",
+    "ethers": "^6.16.0",
+    "hardhat": "^3.1.12",
     "tailwindcss": "^4",
     "typescript": "^5"
   }