fix: Skip heavy ML deps in CI security checks

Security scanning tools (Snyk, Bandit, Safety) don't need torch/
transformers installed - they do static analysis of code and
requirements.txt. Installing torch>=2.3 with CUDA deps was
exhausting CI disk space (~3GB+).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

.github/workflows/security-check.yml

@@ -22,7 +22,9 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements.txt
+        # Only install lightweight deps for security scanning
+        # ML packages (torch, transformers) are skipped - not needed for static analysis
+        pip install fastapi uvicorn pydantic python-dotenv aiofiles
     
     # Run Snyk security scan
     - name: Run Snyk Security Scan