feat: lint and format solidity files

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npx lint-staged

.solhint.json

@@ -0,0 +1,16 @@
+{
+  "extends": "solhint:recommended",
+  "rules": {
+    "code-complexity": ["warn", 7],
+    "function-max-lines": ["warn", 50],
+    "max-line-length": ["error", 120],
+    "func-param-name-mixedcase": "warn",
+    "modifier-name-mixedcase": "warn",
+    "ordering": "warn",
+    "compiler-version": ["error", "^0.8.20"],
+    "func-visibility": ["warn", { "ignoreConstructors": true }],
+    "immutable-vars-naming": "off",
+    "one-contract-per-file": "off",
+    "no-console": "off"
+  }
+}

.solhintignore

@@ -0,0 +1,2 @@
+lib
+node_modules/

package.json

@@ -22,9 +22,17 @@
     "@commitlint/config-conventional": "^19.1.0",
     "commitlint": "^19.2.1",
     "hardhat": "^2.12.4",
-    "husky": "^9.0.11"
+    "husky": "^9.0.11",
+    "lint-staged": "^15.2.2",
+    "solhint": "^4.5.2"
   },
   "scripts": {
     "prepare": "husky"
+  },
+  "lint-staged": {
+    "*.sol": [
+      "solhint",
+      "prettier --write --plugin=prettier-plugin-solidity"
+    ]
   }
 }