feat(go): expand remote configuration

[samuelbles07]

Summary

Expose additional AirGradient Go settings through Local Server, cloud fetch, and BLE so remote clients can configure device timing, GPS, indicators, buzzer, and sensor learning behavior.

Changes

• Add shared validated updates and runtime application for measurement, GPS, LED, buzzer, CO2 ABC, and TVOC/NOx learning settings
• Extend Local Server and cloud JSON contracts with the new fields
• Expand the BLE Config snapshot to 19 keys with validated writes and field deltas
• Add host and hardware-integration coverage plus updated service/client documentation

Validation

• Relevant shared config, Local Server, cloud, and BLE host tests passed
• BLE host tests: 106/106 passed
• Go ESP-IDF firmware build passed
• BLE Config integration suite: 21 tests collected
• Local Server integration suite: 45 tests collected
• Ruff and Markdown lint passed