fix: throttle concurrent API calls and 429 backoff - #477
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Closes #369
Root cause: all device/energy coordinators refresh in parallel with no global throttling, triggering Panasonic HTTP 429 for accounts with many devices.
Fix: shared asyncio.Semaphore(3) around cloud calls (device/energy refresh and command apply), small jitter, and a 429-aware exponential backoff (x4 multiplier, 30s floor).
Verification: compile-only (no HA test harness in this repo). Behavior is conservative and degrades gracefully under rate limiting.