chore: fix lint script and align dependabot commit format

- Switch pnpm lint to "eslint src" (Next 16 removed "next lint")
- Add conventional commit-message prefix/scope to dependabot config

.github/dependabot.yml

@@ -13,3 +13,6 @@ updates:
         patterns: ["*"]
     versioning-strategy: increase
     labels: ["dependencies", "security"]
+    commit-message:
+      prefix: "chore"
+      include: "scope"

package.json

@@ -7,7 +7,7 @@
     "dev": "next dev --turbopack",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint"
+    "lint": "eslint src"
   },
   "dependencies": {
     "@vercel/analytics": "^1.5.0",