fix(web): 自动刷新保留 K 线视窗；威科夫与图表增量更新

自动刷新改用 tail update 与 scrollToPosition 恢复视窗，避免 setData 后跳到最右；拆分 chart_tv 模块并扩展 analyze/recent API。同步威科夫分析、pipeline 增量构建及相关策略与配置。

Co-authored-by: Cursor <cursoragent@cursor.com>

web/services/runtime/timeframes.py

@@ -70,36 +70,43 @@ def build_timeframe_labels(timeframes):
 	return labels
 
 
+def _adjacent_smaller(timeframe_keys, ceiling_tf):
+	"""取排序列表中严格小于 ceiling 的相邻周期。"""
+	if not timeframe_keys:
+		return ceiling_tf
+	try:
+		idx = timeframe_keys.index(ceiling_tf)
+		return timeframe_keys[idx - 1] if idx > 0 else timeframe_keys[0]
+	except ValueError:
+		return timeframe_keys[0]
+
+
+def _prefer_smaller(candidates, labels_ordered, ceiling_tf, timeframe_keys):
+	"""从候选中选第一个存在且严格小于 ceiling 的周期，否则回退相邻更小。"""
+	ceil_m = timeframe_to_minutes(ceiling_tf)
+	for tf in candidates:
+		m = timeframe_to_minutes(tf)
+		if tf in labels_ordered and m is not None and ceil_m is not None and m < ceil_m:
+			return tf
+	return _adjacent_smaller(timeframe_keys, ceiling_tf)
+
+
 def compute_timeframe_defaults(labels_ordered):
 	"""
 	根据已排序的「周期 → 中文标签」映射，计算主 / 次 / 次次周期默认值。
+	默认偏好：主 4h、次 1h、次次 15m。
 	labels_ordered: OrderedDict 或按插入顺序排列的 dict。
 	"""
 	if not labels_ordered:
 		labels_ordered = DEFAULT_TIMEFRAME_LABELS.copy()
 	timeframe_keys = list(labels_ordered.keys())
-	preferred_main = next((tf for tf in ['5m', '15m', '1h'] if tf in labels_ordered), None)
+	preferred_main = next((tf for tf in ['4h', '1h', '15m'] if tf in labels_ordered), None)
 	default_main = preferred_main or (timeframe_keys[0] if timeframe_keys else '1m')
 	if default_main not in labels_ordered and timeframe_keys:
 		default_main = timeframe_keys[0]
 
-	if timeframe_keys:
-		try:
-			idx = timeframe_keys.index(default_main)
-			default_element = timeframe_keys[idx - 1] if idx > 0 else timeframe_keys[0]
-		except ValueError:
-			default_element = timeframe_keys[0]
-	else:
-		default_element = default_main
-
-	if timeframe_keys:
-		try:
-			idx_el = timeframe_keys.index(default_element)
-			default_sub_sub = timeframe_keys[idx_el - 1] if idx_el > 0 else timeframe_keys[0]
-		except ValueError:
-			default_sub_sub = timeframe_keys[0]
-	else:
-		default_sub_sub = default_element
+	default_element = _prefer_smaller(['1h', '15m'], labels_ordered, default_main, timeframe_keys)
+	default_sub_sub = _prefer_smaller(['15m', '5m'], labels_ordered, default_element, timeframe_keys)
 
 	return default_main, default_element, default_sub_sub, timeframe_keys