refactor: 缠论引擎包化与 Web 分层（ECR-001）

将根目录引擎迁入 chanlun/ 并保留兼容 shim；拆分 TF_DF 与 web 服务；
前端模块化；strategies 改用 chanlun 导入；补充 ESS 文档与 golden 回归。

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

web/api/pages.py

@@ -0,0 +1,73 @@
+"""页面路由。"""
+from flask import Blueprint, render_template, send_from_directory
+from services.runtime import *  # noqa: F403
+from services import runtime as R
+
+bp = Blueprint("pages", __name__)
+
+@bp.route('/chan_tv')
+def chan_tv():
+	"""缠论 TradingView 高级图表页面"""
+	return render_template('chan_tv.html')
+
+@bp.route('/charting_library/<path:filename>')
+def serve_charting_library(filename):
+	"""提供 TradingView Charting Library 静态文件"""
+	return send_from_directory('charting_library', filename)
+
+@bp.route('/')
+def index():
+	"""主页"""
+	refresh_data_service_metadata()
+	tf_map = TIMEFRAMES if TIMEFRAMES else DEFAULT_TIMEFRAME_LABELS.copy()
+	default_main, default_element, default_sub_sub, timeframe_keys = compute_timeframe_defaults(OrderedDict(tf_map))
+	symbols = SYMBOLS if SYMBOLS else DEFAULT_SYMBOLS
+
+	default_symbol = 'BTC/USDT:USDT' if 'BTC/USDT:USDT' in symbols else (symbols[0] if symbols else '')
+
+	return render_template(
+		'index.html',
+		timeframes=tf_map,
+		symbols=symbols,
+		a_stock_symbols=A_STOCK_SYMBOLS,
+		default_main_timeframe=default_main,
+		default_element_timeframe=default_element,
+		default_sub_sub_timeframe=default_sub_sub,
+		default_symbol=default_symbol,
+		timeframe_keys_json=json.dumps(timeframe_keys),
+		data_service_available=DATA_SERVICE_AVAILABLE,
+	)
+
+
+@bp.route('/api/chart_metadata')
+def api_chart_metadata():
+	"""
+	按数据源返回图表用 K 线周期（中文标签）及主/次/次次默认周期。
+	crypto：强制刷新 DATA_SERVICE_URL /health 元信息；
+	a_stock：读取 ASHARE_DP_URL 的 /api/v1/klines/available-freqs，不修改全局加密货币 TIMEFRAMES。
+	"""
+	source = (request.args.get('source') or 'crypto').strip().lower()
+	if source not in ('crypto', 'a_stock'):
+		source = 'crypto'
+	try:
+		if source == 'a_stock':
+			raw = china_stock.get_available_kline_freqs()
+			labels_od = build_timeframe_labels(raw)
+		else:
+			refresh_data_service_metadata(force=True)
+			labels_od = OrderedDict(TIMEFRAMES if TIMEFRAMES else DEFAULT_TIMEFRAME_LABELS.copy())
+
+		default_main, default_element, default_sub_sub, keys = compute_timeframe_defaults(labels_od)
+		return jsonify({
+			'source': source,
+			'timeframes': {k: v for k, v in labels_od.items()},
+			'timeframe_keys': keys,
+			'default_main': default_main,
+			'default_element': default_element,
+			'default_sub_sub': default_sub_sub,
+		})
+	except Exception as exc:
+		logger.exception('chart_metadata 失败: %s', exc)
+		return jsonify({'error': str(exc)}), 500
+
+