feat: implement security scanning workflows (CodeQL, ZAP, Gitleaks, Dependabot)

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major"]
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10

.github/workflows/codeql.yml

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+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "master", "main" ]
+  pull_request:
+    branches: [ "master", "main" ]
+  schedule:
+    - cron: '30 2 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'javascript' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+        queries: security-extended,security-and-quality
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v3
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:${{matrix.language}}"

.github/workflows/gitleaks.yml

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+name: Gitleaks
+on:
+  push:
+    branches: [ "master", "main" ]
+  pull_request:
+    branches: [ "master", "main" ]
+
+jobs:
+  scan:
+    name: Secret Scanning
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: gitleaks/gitleaks-action@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITLEAKS_ENABLE_UPLOAD_ARTIFACT: false
+          GITLEAKS_ENABLE_SUMMARY: true

.github/workflows/nuclei-scan.yml

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+name: "Nuclei Security Scan"
+
+on:
+  push:
+    branches: [ "master", "main" ]
+  pull_request:
+    branches: [ "master", "main" ]
+
+jobs:
+  nuclei-scan:
+    runs-on: ubuntu-latest
+    name: Nuclei API & Web Security Scan
+    permissions:
+      contents: read
+      issues: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build Next.js (static export)
+        run: npm run build
+        env:
+          NEXT_PUBLIC_FIREBASE_API_KEY: "mock_api_key"
+          NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN: "mock.firebaseapp.com"
+          NEXT_PUBLIC_FIREBASE_PROJECT_ID: "mock_project_id"
+          NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET: "mock.appspot.com"
+          NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID: "123456789"
+          NEXT_PUBLIC_FIREBASE_APP_ID: "1:123456789:web:abcdef"
+
+      - name: Serve static build
+        run: npx serve@latest out -l 3000 &
+
+      - name: Wait for server to be ready
+        run: |
+          for i in {1..15}; do
+            curl -s http://localhost:3000 > /dev/null && echo "Server is up!" && break
+            echo "Waiting for server... ($i)"
+            sleep 2
+          done
+
+      - name: Run Nuclei Scan
+        uses: projectdiscovery/nuclei-action@v2
+        with:
+          target: http://localhost:3000
+          flags: "-tags exposure,misconfig,headers,tech -severity low,medium,high,critical"
+          output: nuclei-results.txt
+
+      - name: Upload Nuclei Results
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: nuclei-security-report
+          path: nuclei-results.txt
+          retention-days: 30