feat: type listen_Credits with a CreditsEvent dataclass

[Bre77]

Intent

• listen_Credits was typed Callable[[dict[str, str | int]], None] - a bare, incomplete dict shape (it doesn't even account for the quota key, which isn't a str | int). Callers had to hand-parse the dict with no static guarantee of what keys exist.
  • Added CreditsEvent in const.py as a @dataclass, following the same construct as EnergyHistoryTotals (a from_dict classmethod building it from the event's nested dict).
  • Fields (type: str, cost: int, name: str, balance: int, quota: dict[str, Any]) are drawn from the one real fixture in tests/test_energysite_events.py (CREDITS_EVENT), all required since nothing in that sample is omitted.
  • quota is kept as dict[str, Any] rather than a nested dataclass - every observed payload ships it empty, so there's no evidence yet of its internal shape.
  • listen_Credits now returns CreditsEvent instead of the bare dict. Purely additive from the caller's perspective (a plain function still works); the callback's payload shape changes, so this is worth a version bump on release.

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