fix(api): 修复用户列表接口查询和去重逻辑

- 移除无效的查询参数处理，简化SQL查询语句
- 修复对用户ID的重复数据去重逻辑，确保结果唯一
- 统一代码格式和缩进，提高代码可读性
- 保留按user_id升序排序及查询限制功能
- 保证接口在无匹配路由时返回404状态码

server/internal/api/ymt_users.go

@@ -25,19 +25,15 @@ func YMTUsersHandler(ymt *sql.DB) http.Handler {
 }
 
 func (a *YMTUsersAPI) list(w http.ResponseWriter, r *http.Request) {
-    q := r.URL.Query().Get("q")
 	limitStr := r.URL.Query().Get("limit")
 	limit := 2000
 	if limitStr != "" {
-        if n, err := strconv.Atoi(limitStr); err == nil && n > 0 && n <= 10000 { limit = n }
+		if n, err := strconv.Atoi(limitStr); err == nil && n > 0 && n <= 10000 {
+			limit = n
+		}
 	}
 	sql1 := "SELECT DISTINCT user_id, COALESCE(user_name, '') AS name FROM activity WHERE user_id IS NOT NULL"
 	args := []interface{}{}
-    if q != "" {
-        sql1 += " AND (CAST(user_id AS CHAR) LIKE ? OR user_name LIKE ?)"
-        like := "%" + q + "%"
-        args = append(args, like, like)
-    }
 	sql1 += " ORDER BY user_id ASC LIMIT ?"
 	args = append(args, limit)
 	rows, err := a.ymt.Query(sql1, args...)