feat: configurable ticker window for market stats (1h, 4h, 1d)

- Replace hardcoded ticker_24h with ticker_stats supporting configurable window
- Add -w/--window flag to `market tickers` (choices: 1h, 4h, 1d, default 1d)
- Update TUI title and JSON output to include window field
- Keep opportunity/pf service on 1d default
- Sync tests and doc comments

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/test_account_market_services.py

@@ -26,7 +26,7 @@ class FakeSpotClient:
             return list(prices.values())
         return [prices[symbol] for symbol in symbols]
 
-    def ticker_24h(self, symbols=None):
+    def ticker_stats(self, symbols=None, *, window="1d"):
         rows = [
             {
                 "symbol": "BTCUSDT",