refactor: 统一价格入口 mo_data.get_price() - 22个脚本移除自拉腾讯API

所有价格获取统一走 mo_data.get_price() / get_prices_batch():
  - 优先读 live_prices(DB) → 无/过期才调 stock_quote(API) → 自动写回DB
  - 22个脚本全部替换：branch_scanner chip_factors divergence_detector
    market_screener mo_provider mofin_collect monitor_300308 300308_monitor
    multi_timeframe refresh_macro_context stale_detector stale_push_wlin
    stock_profile strategy_evaluator strategy_lifecycle strategy_review
    strategy-staleness-check technical_analysis xiaoguo_signal_consumer
    collect_evaluation_data

scripts/monitor_300308.py

@@ -11,8 +11,9 @@
 发一次信号后就停，不再重复。
 """
 
-import json, os, subprocess, sys, urllib.request
+import json, os, subprocess, sys
 from datetime import datetime
+from mo_data import get_price
 
 CODE = "300308"
 NAME = "中际旭创"
@@ -40,18 +41,9 @@ def save_state(s):
 
 
 def fetch_price():
-    """从腾讯API获取实时价"""
-    url = f"http://qt.gtimg.cn/q=sz{CODE}"
-    req = urllib.request.Request(url, headers={"User-Agent": "Mozilla/5.0"})
-    try:
-        resp = urllib.request.urlopen(req, timeout=10)
-        text = resp.read().decode("gbk")
-        fields = text.split("~")
-        price = float(fields[3]) if fields[3] else 0
-        change_pct = fields[32] if len(fields) > 32 else "0"
-        return price, change_pct
-    except Exception as e:
-        return 0, "0"
+    """从统一入口获取实时价"""
+    price, chg = get_price(CODE)
+    return price or 0, chg or 0
 
 
 def send_alert(price, change_pct):