fix: improve endpoint recovery and network diagnostics

[kwalus]

Summary

• improve peer recovery for internet and mixed-network setups by preferring better public or tunnel endpoints ahead of stale remembered LAN paths
• make introduced-peer connection and manual reconnect behavior more consistent with the stronger endpoint recovery path now used in the app
• reduce routine websocket probe and reconnect log noise so real connection failures are easier to spot while shipping the 0.6.2 patch release metadata

Test plan

• python3 -m pytest -q tests/test_connect_introduced_broker_fallback.py tests/test_network_connectivity_regressions.py tests/test_api_session_fallback.py tests/test_connection_log_noise_regressions.py
• python3 -m py_compile canopy/api/routes.py canopy/network/connection.py canopy/network/manager.py canopy/init.py tests/test_connect_introduced_broker_fallback.py tests/test_api_session_fallback.py
• Local verification on the latest 0.6.2 build
• Final human review of the public patch PR