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>

config.example.yaml

@@ -119,18 +119,18 @@ mesh_sources: []
 #   enabled: true
 #   region_radius_miles: 40.0      # Radius for region clustering
 #   locality_radius_miles: 8.0     # Radius for locality clustering
-#   offline_threshold_hours: 24    # Hours before node considered offline
+#   offline_threshold_hours: 2     # Hours before node considered offline
 #   packet_threshold: 500          # Non-text packets per 24h to flag
-#   battery_warning_percent: 20    # Battery level for warnings
+#   battery_warning_percent: 30    # Battery level for warnings
 #   infra_overrides: []            # Node IDs to exclude from infrastructure
 #   region_labels: {}              # Override auto-names: {"Twin Falls": "Magic Valley"}
 mesh_intelligence:
   enabled: false
   region_radius_miles: 40.0
   locality_radius_miles: 8.0
-  offline_threshold_hours: 24
+  offline_threshold_hours: 2
   packet_threshold: 500
-  battery_warning_percent: 20
+  battery_warning_percent: 30
   infra_overrides: []
   region_labels: {}