fix: restore swarm control and windows node connectivity ...

- Resolved LLM provider identification issue in PreferenceService by implementing strict prefix matching and model version parsing.
- Enforced strict tenant-level LLM resolution by removing all system-wide hardcoded fallbacks to 'gemini'.
- Fixed Windows node persistence by updating SchtasksManager to explicitly set the working directory for background agent tasks.
- Hardened bootstrap_windows.ps1 with explicit watchdog and dependency verification to ensure reliable file sync on Windows.
- Added self-correcting path logic to install_service.py to resolve agent_node package imports.