refactor(ci): modularize workflows into ci, code-quality, security, deploy

- Split monolithic ci.yml into focused workflow files
- Add code-quality.yml with complexity analysis and duplicate detection
- Replace template codeql.yml with comprehensive security.yml (CodeQL, dependency audit, dependency review, secret scan)
- Separate deploy into its own workflow triggered by CI success

.github/workflows/security.yml

@@ -0,0 +1,80 @@
+name: Security
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: '0 6 * * 1'
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  codeql:
+    name: CodeQL Analysis
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: javascript-typescript
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3
+
+  dependency-audit:
+    name: Dependency Audit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - run: npm ci
+
+      - name: Run npm audit
+        run: npm audit --audit-level=moderate || true
+
+      - name: Check for critical vulnerabilities
+        run: |
+          CRITICAL=$(npm audit --json 2>/dev/null | jq '[.vulnerabilities | to_entries[] | select(.value.severity == "critical")] | length' 2>/dev/null || echo "0")
+          if [ "$CRITICAL" -gt 0 ]; then
+            echo "::error::Found $CRITICAL critical vulnerabilities"
+            exit 1
+          fi
+
+  dependency-review:
+    name: Dependency Review
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Dependency Review
+        uses: actions/dependency-review-action@v4
+        with:
+          fail-on-severity: high
+          deny-licenses: GPL-3.0, AGPL-3.0
+
+  secret-scan:
+    name: Secret Scan
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: TruffleHog Secret Scan
+        uses: trufflesecurity/trufflehog@main
+        with:
+          path: ./
+          base: ${{ github.event.repository.default_branch }}
+          extra_args: --only-verified