Add 109 more tests to reach 86% coverage (2074 total)

- 27 MCP tool tests (mcp_server.py 55% → 90%+)
- 7 app integration tests (app.py 41% → 90%+)
- 5 backend factory tests (backends/__init__.py 46% → 100%)
- 23 analyzer tests (analyzer.py 69% → 85%+)
- 10 registry tests (registry.py 74% → 90%+)
- 27 file discovery tests (file_discovery.py 75% → 85%+)
- Fix: mcp_server generate_flow format→fmt bug

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: aksOps

.gitignore

@@ -59,3 +59,4 @@ docs/specs/
 # Distribution
 *.tar.gz
 *.zip
+pytest-of-dev/