Feat/sos connect4

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.eslintignore

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+node_modules
+dist
+.kilo
+*.lock
+e2e/
+load/

.eslintrc.js

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+module.exports = {
+  root: true,
+  env: {
+    es2021: true,
+  },
+  extends: ['eslint:recommended'],
+  parserOptions: {
+    ecmaVersion: 'latest',
+  },
+  overrides: [
+    {
+      files: ['api/**/*.js', '*.config.js', '*.config.mjs', '.eslintrc.js'],
+      env: { node: true, es2021: true },
+      parserOptions: { sourceType: 'script' },
+      rules: {
+        'no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+        'no-console': 'off',
+      },
+    },
+    {
+      files: ['pro/**/*.js', 'pro/**/*.jsx'],
+      env: { browser: true, es2021: true },
+      parserOptions: {
+        sourceType: 'module',
+        ecmaFeatures: { jsx: true },
+      },
+      plugins: ['react', 'react-hooks'],
+      extends: ['eslint:recommended', 'plugin:react/recommended', 'plugin:react-hooks/recommended'],
+      settings: { react: { version: 'detect' } },
+      rules: {
+        'no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+        'react/react-in-jsx-scope': 'off',
+        'react/prop-types': 'off',
+        'no-console': 'off',
+      },
+    },
+    {
+      files: ['*.test.js', '*.test.jsx'],
+      env: { mocha: true, jest: true },
+      rules: {
+        'no-unused-expressions': 'off',
+      },
+    },
+  ],
+};

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main, fix/*, feat/*]
+  pull_request:
+    branches: [main]
+
+jobs:
+  api:
+    name: API (Server)
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+          cache-dependency-path: |
+            package-lock.json
+            api/package-lock.json
+
+      - name: Install root dependencies
+        run: npm ci
+        working-directory: .
+      - name: Install API dependencies
+        run: npm ci
+        working-directory: api
+      - name: Lint
+        run: npx eslint --ext .js . --max-warnings 50
+        working-directory: .
+      - name: Test
+        run: npm test
+        working-directory: api
+
+  pro:
+    name: Frontend
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+          cache-dependency-path: |
+            package-lock.json
+            pro/package-lock.json
+
+      - name: Install root dependencies
+        run: npm ci
+        working-directory: .
+      - name: Install Frontend dependencies
+        run: npm ci
+        working-directory: pro
+      - name: Lint
+        run: npx eslint --ext .js,.jsx . --max-warnings 50
+        working-directory: .
+      - name: Test
+        run: npx vitest run
+        working-directory: pro
+
+  e2e:
+    name: E2E (Playwright)
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+          cache-dependency-path: |
+            api/package-lock.json
+            pro/package-lock.json
+
+      - name: Install API dependencies
+        run: npm ci
+        working-directory: api
+
+      - name: Install Frontend dependencies
+        run: npm ci
+        working-directory: pro
+
+      - name: Install E2E dependencies
+        run: npm install
+        working-directory: e2e
+
+      - name: Install Playwright browsers
+        run: npx playwright install --with-deps chromium
+        working-directory: e2e
+
+      - name: Run E2E tests
+        run: npx playwright test
+        working-directory: e2e
+        env:
+          CI: true
+
+      - name: Upload Playwright report
+        uses: actions/upload-artifact@v4
+        if: failure()
+        with:
+          name: playwright-report
+          path: e2e/playwright-report/
+          retention-days: 7
+
+  load:
+    name: Load Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+          cache-dependency-path: |
+            api/package-lock.json
+
+      - name: Install API dependencies
+        run: npm ci
+        working-directory: api
+
+      - name: Install Load Test dependencies
+        run: npm install
+        working-directory: load
+
+      - name: Start API server
+        run: |
+          node index.js &
+          echo "Waiting for server..."
+          for i in $(seq 1 10); do
+            curl -s http://localhost:4000/health > /dev/null && echo "Server ready" && break
+            sleep 1
+          done
+        working-directory: api
+
+      - name: Run load test
+        run: node runner.js --connections 10 --duration 15
+        working-directory: load
+        env:
+          LOAD_SERVER_URL: http://localhost:4000
+
+      - name: Stop API server
+        run: kill $(lsof -t -i:4000) 2>/dev/null || true
+
+      - name: Upload load report
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: load-report
+          path: load/*.log
+          retention-days: 7

.gitignore

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+node_modules/

.husky/pre-commit

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+npx lint-staged