Phase 1: ProjectEngine + PyEnvManager + project management WebUI

- New: services/project_engine.py (async subprocess manager)
- New: services/pyenv_manager.py (Python version + venv + git clone)
- New: services/web_panel/routes/projects.py (5 REST endpoints)
- New: static/web_panel/pages/projects.html (WebUI)
- Tests: 28/28 passing, API verified (GET /api/projects)
- Docs: Phase1_Progress.md (local)

config/services/network_routes.yaml

@@ -1,5 +1,5 @@
 http_port: 4200
-last_updated: 248209.231599689
+last_updated: 252439.682639846
 plugin_routes:
   example_plugin:
   - methods: