fix(quickadapter): preserve label params per candle (#112)

fix(quickadapter): preserve label params per candle (#112)

* fix(quickadapter): preserve label params per candle

* fix(quickadapter): reject invalid dynamic label params

* refactor(quickadapter): harden label-param validation and dedupe runmode gate

- add _is_finite_number guard rejecting bool and non-numeric before
  np.isfinite (which raised on str/object) across the label getters/setters
- factor the duplicated runmode-in-TRADE_MODES predicate into the
  is_trade_runmode cached_property
- document the per-candle NATR construction and drop the redundant fillna
  after where() in the per-row NATR path
- note that backtest and hyperopt (not only backtest) retain the per-candle
  label period in the README