feat(channel-pricing): InitDB 启动时全量加载渠道定价缓存

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

model/main.go

@@ -203,7 +203,11 @@ func InitDB() (err error) {
 		}
 		common.SysLog("database migration started")
 		err = migrateDB()
-		return err
+		if err != nil {
+			return err
+		}
+		LoadChannelPricingCache()
+		return nil
 	} else {
 		common.FatalLog(err)
 	}