feat: add GitHub Actions lint workflow (#64)

.github/workflows/lint.yml

@@ -0,0 +1,98 @@
+name: Lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - "**"
+
+jobs:
+  lint-frontend:
+    name: Frontend (ESLint + Prettier)
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: frontend
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: "npm"
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint
+
+      - name: Run Prettier check
+        run: npm run format:check
+
+  lint-backend:
+    name: Backend (ESLint + Prettier)
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: backend
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: "npm"
+          cache-dependency-path: backend/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint
+
+      - name: Run Prettier check
+        run: npm run format:check
+
+  lint-contracts:
+    name: Smart Contracts (Clippy + rustfmt)
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: contracts
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+          targets: wasm32-unknown-unknown
+
+      - name: Cache Rust build artifacts
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            contracts/target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('contracts/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Run Clippy (deny warnings)
+        run: cargo clippy --all-targets --all-features -- -D warnings
+
+      - name: Run rustfmt check
+        run: cargo fmt --all -- --check

.prettierrc

@@ -1,8 +1,7 @@
 {
   "semi": true,
-  "trailingComma": "all",
   "singleQuote": true,
-  "printWidth": 100,
   "tabWidth": 2,
-  "useTabs": false
+  "trailingComma": "es5",
+  "printWidth": 100
 }

backend/eslint.config.js

@@ -0,0 +1,33 @@
+import tseslint from '@typescript-eslint/eslint-plugin';
+import tsparser from '@typescript-eslint/parser';
+
+export default [
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parser: tsparser,
+      parserOptions: {
+        ecmaVersion: 'latest',
+        sourceType: 'module',
+      },
+    },
+    plugins: {
+      '@typescript-eslint': tseslint,
+    },
+    rules: {
+      ...tseslint.configs.recommended.rules,
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          argsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+          caughtErrorsIgnorePattern: '^_',
+        },
+      ],
+      '@typescript-eslint/no-namespace': 'off',
+    },
+  },
+  {
+    ignores: ['dist/**', 'node_modules/**'],
+  },
+];