fix: add --offline flag to safety scan in fix.yml workflow

Complete offline mode coverage for all safety scan commands.

Changes:
- Add --offline flag to safety scan in fix.yml
- Ensures consistent offline mode across all workflows
- No authentication required for security scanning
- Maintains full dependency security scanning capability

This completes the transition to offline safety scanning across
all workflows, ensuring no authentication prompts in CI/CD.

.gitea/workflows/fix.yml

@@ -92,7 +92,7 @@ jobs:
             # Check for common Python security issues
             echo "Running safety check..."
             venv/bin/pip install safety
-            venv/bin/safety scan || echo "Safety scan completed with warnings"
+            venv/bin/safety scan --offline || echo "Safety scan completed with warnings"
           else
             echo "❌ No supported project type found!"
             exit 1