feat: Phase 1 — multi-source data aggregation from Meshview and MeshMonitor APIs

- Add MeshviewSource class for fetching nodes, edges, stats from Meshview API
- Add MeshMonitorDataSource class for fetching nodes, channels, telemetry,
  traceroutes, network stats, topology, packets, solar from MeshMonitor API
- Add MeshSourceManager for managing multiple sources with aggregation
- Add MeshSourceConfig dataclass and mesh_sources list to config
- Integrate source_manager into main.py with periodic refresh
- Add source_manager parameter to MessageRouter (for future Phase 3)
- Add Mesh Sources TUI menu with add/edit/remove/test functionality
- Update config.example.yaml with mesh_sources section

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

config.example.yaml

@@ -71,7 +71,7 @@ weather:
 # === MESHMONITOR INTEGRATION ===
 meshmonitor:
   enabled: false                 # Enable MeshMonitor trigger sync
-  url: ""                        # MeshMonitor web UI URL (e.g. http://192.168.1.100:8080)
+  url: ""                        # MeshMonitor web UI URL (e.g. http://192.168.1.100:3333)
   inject_into_prompt: true       # Include trigger list in LLM prompt
   refresh_interval: 300          # Seconds between trigger refreshes
 
@@ -80,5 +80,23 @@ knowledge:
   enabled: false                 # Enable knowledge base search
   db_path: ""                    # Path to knowledge SQLite database
   top_k: 5                       # Number of chunks to retrieve per query
-  fts_weight: 0.5                # Weight for FTS5 keyword matches (0-1)
-  vector_weight: 0.5             # Weight for vector semantic matches (0-1)
+
+# === MESH DATA SOURCES ===
+# Connect to Meshview and/or MeshMonitor instances for live mesh
+# network analysis. Supports multiple sources. Configure via TUI
+# with meshai --config (Mesh Sources menu).
+#
+# mesh_sources:
+#   - name: "my-meshview"
+#     type: meshview
+#     url: "https://meshview.example.com"
+#     refresh_interval: 300
+#     enabled: true
+#
+#   - name: "my-meshmonitor"
+#     type: meshmonitor
+#     url: "http://192.168.1.100:3333"
+#     api_token: "${MM_API_TOKEN}"
+#     refresh_interval: 300
+#     enabled: true
+mesh_sources: []