feat(CA): hvacInfo→remoteControl self-correcting retry in start_climate

[blka]

Problem

Newer CA EV vehicles (EV9, IONIQ 9) require the remoteControl payload key instead of hvacInfo for climate start. The previous approach used a brand/model whitelist (hardcoded EV9 for Kia, IONIQ 9 for Hyundai) — fragile and requires updating for every new model.

Solution

Replace the whitelist with a self-correcting retry:

1. Try hvacInfo first (works for most vehicles)
2. If responseCode != 0, retry with remoteControl
3. If both fail, _check_response_for_errors raises the appropriate exception

This matches the pattern used by egmp-bluelink-scriptable and eliminates the need for a vehicle model whitelist.

Refactoring

• Extracted _build_ev_climate_payload(token, options, hex_set_temp, use_remote_control=False) helper
• Removed brand-specific EV9/IONIQ 9 branching in favor of try-retry pattern

Testing

4 unit tests:

• Retry on hvacInfo failure → remoteControl success
• No retry on hvacInfo success
• Raise error when both fail
• Payload structure verification (remoteControl vs hvacInfo key)