修复今日最高：新增 city_daily_max 表，所有数据源写入日最高

- DB: city_daily_max(icao,max_temp,obs_date,max_time) upsert
- AMOS/JMA/KNMI/FMI/HKO/METAR集群/CWA 采集后均写入
- Rust: 读 city_daily_max 获取准确日最高 + 时间
- 卡片恢复 High 行，显示最高温 + 达成时间
- new_high 提醒也基于真实日最高重新生效

Tested: cargo build + ruff check 均通过

src/data_collection/settlement_sources.py

@@ -377,6 +377,17 @@ class SettlementSourceMixin:
                 )
             except Exception:
                 logger.exception("airport_obs_log append failed for cwa")
+            try:
+                from src.database.db_manager import DBManager
+                today = datetime.now().strftime("%Y-%m-%d")
+                tc = payload["current"]["temp"]
+                if tc is not None:
+                    DBManager().upsert_daily_max(
+                        icao="466920", temp_c=tc, obs_date=today,
+                        obs_time=str(obs_time_raw or "").strip(),
+                    )
+            except Exception:
+                pass
             return payload
         except Exception as exc:
             logger.warning(f"CWA settlement fetch failed: {exc}")