ci: add CodeQL, Semgrep, Gitleaks, Trivy security scanning

.github/workflows/codeql.yml

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+name: "CodeQL Security Analysis"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    # Run weekly on Monday at 6 AM UTC
+    - cron: '0 6 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze Code
+    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: ${{ matrix.language }}
+          queries: security-extended # More thorough than default
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v3
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: "/language:${{matrix.language}}"

.github/workflows/gitleaks.yml

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+name: Secret Scanning (Gitleaks)
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  scan:
+    name: Scan for secrets
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Full history for accurate scanning
+
+      - name: Install Gitleaks
+        run: |
+          curl -sSfL https://github.com/gitleaks/gitleaks/releases/download/v8.30.0/gitleaks_8.30.0_linux_x64.tar.gz | tar -xz
+          sudo mv gitleaks /usr/local/bin/
+
+      - name: Run Gitleaks
+        run: gitleaks detect --source . --config .gitleaks.toml --verbose

.github/workflows/semgrep.yml

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+name: Semgrep SAST
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  semgrep:
+    name: Semgrep security scan
+    runs-on: ubuntu-latest
+
+    container:
+      image: semgrep/semgrep:1.79
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run Semgrep
+        run: |
+          semgrep scan \
+            --config p/security-audit \
+            --config p/secrets \
+            --config p/owasp-top-ten \
+            --config p/javascript \
+            --config p/typescript \
+            --sarif \
+            --output=semgrep.sarif \
+            --metrics=off
+
+      - name: Upload SARIF to GitHub Security
+        uses: github/codeql-action/upload-sarif@v3
+        if: always()
+        with:
+          sarif_file: semgrep.sarif

.github/workflows/trivy.yml

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+name: Trivy Security Scan
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: '0 3 * * *'  # Daily at 3 AM UTC
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  scan:
+    name: Trivy vulnerability scan
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run Trivy vulnerability scanner (filesystem)
+        uses: aquasecurity/trivy-action@0.34.0
+        with:
+          scan-type: 'fs'
+          scan-ref: '.'
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+          severity: 'CRITICAL,HIGH,MEDIUM'
+          ignore-unfixed: false
+
+      - name: Upload Trivy results to GitHub Security
+        uses: github/codeql-action/upload-sarif@v3
+        if: always()
+        with:
+          sarif_file: 'trivy-results.sarif'
+
+      - name: Run Trivy for npm dependencies
+        uses: aquasecurity/trivy-action@0.34.0
+        with:
+          scan-type: 'fs'
+          scan-ref: '.'
+          scanners: 'vuln'
+          format: 'table'
+          exit-code: 0
+          severity: 'CRITICAL,HIGH'