feat: add commitlint configuration for standardized commit messages

- Introduced commitlint with @commitlint/cli and @commitlint/config-conventional as devDependencies in package.json.
- Created a new commitlint.config.mjs file to enforce conventional commit message standards.
- Updated pnpm-lock.yaml to include the new dependencies and their resolution details.

Author: betterhyq

commitlint.config.mjs

@@ -0,0 +1,3 @@
+const config = { extends: ["@commitlint/config-conventional"] };
+
+export default config;

package.json

@@ -27,6 +27,8 @@
   },
   "devDependencies": {
     "@biomejs/biome": "2.4.4",
+    "@commitlint/cli": "20.4.2",
+    "@commitlint/config-conventional": "20.4.2",
     "@tailwindcss/postcss": "4.2.1",
     "@types/node": "20.19.35",
     "@types/react": "19.2.14",