Marshallhhhh/feature/create backend lint and format workflows

.github/workflows/backend-lint.yml

@@ -0,0 +1,31 @@
+name: backend lint and format check
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - 'app-backend/**'
+      - '.github/workflows/backend-lint.yml'
+  workflow_dispatch: {}
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: app-backend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: ESLint
+        run: npm run lint
+
+      - name: Prettier
+        run: npm run format:check

app-backend/eslint.config.js

@@ -4,6 +4,14 @@ import { defineConfig } from "eslint/config";
 
 
 export default defineConfig([
-  { files: ["**/*.{js,mjs,cjs}"], plugins: { js }, extends: ["js/recommended"] },
-  { files: ["**/*.{js,mjs,cjs}"], languageOptions: { globals: {...globals.browser, ...globals.node} } },
-]);
+  { 
+    files: ["**/*.{js,mjs,cjs}"], 
+    plugins: { js }, 
+    extends: ["js/recommended"],
+    languageOptions: { globals: {...globals.browser, ...globals.node} },
+    rules: {
+      "no-unused-vars": [
+        "error", { argsIgnorePattern: "^_", varsIgnorePattern: "^_" }],
+    }
+  }
+]);