feat(security): GitHub Actions security.yml (mirror coverage)

Дополнительный security-сканирование на GitHub mirror: hadolint-action, gitleaks-action, semgrep, trivy-action. Запускается на push + PR + weekly cron (Mon 03:00 UTC).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/security.yml

@@ -0,0 +1,59 @@
+name: security
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+  schedule:
+    # Каждый понедельник 03:00 UTC — независимый weekly scan
+    - cron: '0 3 * * 1'
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  hadolint:
+    runs-on: ubuntu-latest
+    if: hashFiles('Dockerfile') != ''
+    steps:
+      - uses: actions/checkout@v4
+      - uses: hadolint/hadolint-action@v3.1.0
+        with:
+          dockerfile: Dockerfile
+          failure-threshold: error
+        continue-on-error: true
+
+  gitleaks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: gitleaks/gitleaks-action@v2
+        continue-on-error: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  semgrep:
+    runs-on: ubuntu-latest
+    container:
+      image: returntocorp/semgrep:latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: semgrep ci --config=p/javascript --config=p/react --config=p/typescript --config=p/security-audit
+        continue-on-error: true
+
+  trivy:
+    runs-on: ubuntu-latest
+    if: hashFiles('Dockerfile') != ''
+    steps:
+      - uses: actions/checkout@v4
+      - uses: aquasecurity/trivy-action@master
+        with:
+          scan-type: fs
+          scan-ref: .
+          severity: HIGH,CRITICAL
+          ignore-unfixed: true
+          exit-code: '0'