ci: add comprehensive CI/CD pipelines

GitHub Actions workflows:
1. CI/CD Pipeline (ci-cd.yml)
   - Automated testing (Python 3.11, 3.12)
   - Code linting (black, isort, flake8)
   - Docker image build
   - Staging/Production deployment
   - Code coverage reporting

2. Security Scan (security.yml)
   - Dependency vulnerability check (safety)
   - Security linting (bandit)
   - Weekly scheduled scans
   - Dependency review for PRs

3. Release (release.yml)
   - Automated release creation
   - Docker image build and push
   - Semantic versioning tags

Features:
- ✅ Multi-Python version testing
- ✅ Pip package caching
- ✅ Code coverage with Codecov
- ✅ Security scanning
- ✅ Automated deployments
- ✅ Docker Hub integration

Phase 4 Tasks 61-62 completed (88.2% → 91.2%)!

.github/workflows/security.yml

@@ -0,0 +1,59 @@
+name: Security Scan
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    # Run every Monday at 00:00 UTC
+    - cron: '0 0 * * 1'
+
+jobs:
+  security-scan:
+    name: Security Scan
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.12'
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install safety bandit
+    
+    - name: Check for known security vulnerabilities
+      run: |
+        pip install -r requirements.txt
+        safety check --json
+    
+    - name: Run Bandit security linter
+      run: |
+        bandit -r packages/ apps/ -f json -o bandit-report.json || true
+        cat bandit-report.json
+    
+    - name: Upload security reports
+      uses: actions/upload-artifact@v3
+      if: always()
+      with:
+        name: security-reports
+        path: |
+          bandit-report.json
+
+  dependency-review:
+    name: Dependency Review
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - name: Dependency Review
+      uses: actions/dependency-review-action@v3