fix: notification system improvements and threshold corrections

- Fix leftover severity references (info→routine in filter dropdown)
- Fix node_id int handling in connector and channels (handle both int and string)
- Add LLM-generated reports for notifications (replace raw data dumps)
- Fix health.score.composite attribute path for RF reports
- Add deterministic HF band conditions from SFI/Kp values
- Remove max_tokens from LLM calls (character limits at delivery)
- Weather feed improvements: show event_type + area, local events first
- Fix is_online to use configured offline_threshold_hours in data store
- Update stale defaults: offline 24→2h, battery_warning 20→30%
- Add TODO comments for packet_threshold scale bug

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

meshai/config.py

@@ -284,6 +284,7 @@ class MeshIntelligenceConfig:
     locality_radius_miles: float = 8.0  # Radius for locality clustering within regions
     offline_threshold_hours: int = 2  # Hours before node considered offline
     packet_threshold: int = 500  # Non-text packets per 24h to flag
+    # TODO: behavior pillar uses wrong scale - see meshai-v03-notification-handoff.md bug #2
     battery_warning_percent: int = 30  # Battery level for warnings
 
     # Alert settings