降低市场监控Telegram推送频率，减少重复通知

收紧推送周期、冷却时间和触发门槛的默认值，避免52城
同时监控导致的通知轰炸。删除不再使用的doc_refresher技能。

Constraint: 用户反馈电报群通知太频繁且同城市重复推送
Rejected: 在.env中配置 | 用户要求写死在代码默认值中
Confidence: high
Scope-risk: narrow
Directive: 如需临时放宽，仍可通过同名环境变量覆盖
Tested: Not-tested: 需实际运行bot验证推送频率

src/bot/runtime_coordinator.py

@@ -154,7 +154,7 @@ class StartupCoordinator:
     def _start_trade_alert_loop(self) -> LoopStatus:
         enabled = _env_bool("TELEGRAM_ALERT_PUSH_ENABLED", True)
         chat_ids = get_telegram_chat_ids_from_env()
-        interval = max(60, _env_int("TELEGRAM_ALERT_PUSH_INTERVAL_SEC", 300))
+        interval = max(60, _env_int("TELEGRAM_ALERT_PUSH_INTERVAL_SEC", 1800))
         cities_count = _parse_csv_count(os.getenv("TELEGRAM_ALERT_CITIES"))
         details = {
             "mode": "critical-alerts-and-focus-digest",
@@ -163,19 +163,19 @@ class StartupCoordinator:
             "chat_targets": len(chat_ids),
             "alert_cooldown_sec": max(
                 60,
-                _env_int("TELEGRAM_ALERT_PUSH_COOLDOWN_SEC", 1800),
+                _env_int("TELEGRAM_ALERT_PUSH_COOLDOWN_SEC", 21600),
             ),
             "mispricing_interval_sec": max(
-                max(60, _env_int("TELEGRAM_ALERT_PUSH_COOLDOWN_SEC", 1800)),
-                _env_int("TELEGRAM_ALERT_MISPRICING_INTERVAL_SEC", 7200),
+                max(60, _env_int("TELEGRAM_ALERT_PUSH_COOLDOWN_SEC", 21600)),
+                _env_int("TELEGRAM_ALERT_MISPRICING_INTERVAL_SEC", 43200),
             ),
-            "min_trigger_count": max(1, _env_int("TELEGRAM_ALERT_MIN_TRIGGER_COUNT", 2)),
-            "min_severity": str(os.getenv("TELEGRAM_ALERT_MIN_SEVERITY") or "medium").strip().lower(),
+            "min_trigger_count": max(1, _env_int("TELEGRAM_ALERT_MIN_TRIGGER_COUNT", 3)),
+            "min_severity": str(os.getenv("TELEGRAM_ALERT_MIN_SEVERITY") or "high").strip().lower(),
             "mispricing_only": _env_bool("TELEGRAM_ALERT_MISPRICING_ONLY", True),
             "focus_digest_enabled": _env_bool("TELEGRAM_MARKET_FOCUS_DIGEST_ENABLED", True),
             "focus_digest_interval_sec": max(
                 300,
-                _env_int("TELEGRAM_MARKET_FOCUS_DIGEST_INTERVAL_SEC", 1800),
+                _env_int("TELEGRAM_MARKET_FOCUS_DIGEST_INTERVAL_SEC", 21600),
             ),
             "focus_push_start_local_hour": min(
                 23,