fix: JSON_CONTAINS 参数类型修复 + API sync

- 修复 JSON_CONTAINS(node_group_ids, int64) 类型错误，改为传 JSON 字符串
- 添加 node_group_ids IS NOT NULL 兼容判断，防止 NULL 列报错
- 同步 apis/ 及 routes.go、compat_types.go 改动

Co-Authored-By: claude-flow <ruv@ruv.net>

apis/public/user.api

@@ -220,6 +220,22 @@ type (
 		FriendlyCount int64 `json:"friendly_count"`
 		HistoryCount  int64 `json:"history_count"`
 	}
+	GetUserTrafficStatsRequest {
+		UserSubscribeId string `form:"user_subscribe_id" validate:"required"`
+		Days            int    `form:"days" validate:"required,oneof=7 30"`
+	}
+	DailyTrafficStats {
+		Date     string `json:"date"`
+		Upload   int64  `json:"upload"`
+		Download int64  `json:"download"`
+		Total    int64  `json:"total"`
+	}
+	GetUserTrafficStatsResponse {
+		List          []DailyTrafficStats `json:"list"`
+		TotalUpload   int64               `json:"total_upload"`
+		TotalDownload int64               `json:"total_download"`
+		TotalTraffic  int64               `json:"total_traffic"`
+	}
 )
 
 @server (
@@ -374,11 +390,15 @@ service ppanel {
 
 	@doc "Get Subscribe Status"
 	@handler GetSubscribeStatus
-	get /subscribe_status (GetSubscribeStatusRequest) returns (GetSubscribeStatusResponse)
+	post /subscribe_status (GetSubscribeStatusRequest) returns (GetSubscribeStatusResponse)
 
 	@doc "Get User Invite Stats"
 	@handler GetUserInviteStats
 	get /invite_stats (GetUserInviteStatsRequest) returns (GetUserInviteStatsResponse)
+
+	@doc "Get User Traffic Statistics"
+	@handler GetUserTrafficStats
+	get /traffic_stats (GetUserTrafficStatsRequest) returns (GetUserTrafficStatsResponse)
 }
 
 @server (