chore: add CI and security workflows

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  frontend:
+    name: Frontend build and audit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 10
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: pnpm
+
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm run build
+      - run: pnpm audit --audit-level moderate
+      - run: npm audit --audit-level=moderate

.github/workflows/security.yml

@@ -0,0 +1,44 @@
+name: Security
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+  schedule:
+    - cron: "29 7 * * 1"
+  workflow_dispatch:
+
+permissions:
+  actions: read
+  contents: read
+  pull-requests: read
+  security-events: write
+
+jobs:
+  dependency-review:
+    name: Dependency review
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/dependency-review-action@v4
+        with:
+          fail-on-severity: moderate
+
+  codeql:
+    name: CodeQL
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ["javascript-typescript"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+      - uses: github/codeql-action/autobuild@v3
+      - uses: github/codeql-action/analyze@v3
+        with:
+          category: "/language:${{ matrix.language }}"