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

@@ -1,76 +1,72 @@
 package api
 
 import (
-    "database/sql"
-    "fmt"
-    "net/http"
-    "strconv"
-    "strings"
+	"database/sql"
+	"fmt"
+	"net/http"
+	"strconv"
+	"strings"
 )
 
 type YMTUsersAPI struct {
-    ymt *sql.DB
+	ymt *sql.DB
 }
 
 func YMTUsersHandler(ymt *sql.DB) http.Handler {
-    api := &YMTUsersAPI{ymt: ymt}
-    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-        p := strings.TrimPrefix(r.URL.Path, "/api/ymt/users")
-        if r.Method == http.MethodGet && p == "" {
-            api.list(w, r)
-            return
-        }
-        w.WriteHeader(http.StatusNotFound)
-    })
+	api := &YMTUsersAPI{ymt: ymt}
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		p := strings.TrimPrefix(r.URL.Path, "/api/ymt/users")
+		if r.Method == http.MethodGet && p == "" {
+			api.list(w, r)
+			return
+		}
+		w.WriteHeader(http.StatusNotFound)
+	})
 }
 
 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 }
-    }
-    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...)
-    if err != nil {
-        fail(w, r, http.StatusInternalServerError, err.Error())
-        return
-    }
-    defer rows.Close()
+	limitStr := r.URL.Query().Get("limit")
+	limit := 2000
+	if limitStr != "" {
+		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{}{}
+	sql1 += " ORDER BY user_id ASC LIMIT ?"
+	args = append(args, limit)
+	rows, err := a.ymt.Query(sql1, args...)
+	if err != nil {
+		fail(w, r, http.StatusInternalServerError, err.Error())
+		return
+	}
+	defer rows.Close()
 
-    out := []map[string]interface{}{}
-    used := map[int64]struct{}{}
-    for rows.Next() {
-        var id sql.NullInt64
-        var name sql.NullString
-        if err := rows.Scan(&id, &name); err != nil {
-            continue
-        }
-        if !id.Valid {
-            continue
-        }
-        if _, ok := used[id.Int64]; ok {
-            // 根据 ID 去重
-            continue
-        }
-        used[id.Int64] = struct{}{}
+	out := []map[string]interface{}{}
+	used := map[int64]struct{}{}
+	for rows.Next() {
+		var id sql.NullInt64
+		var name sql.NullString
+		if err := rows.Scan(&id, &name); err != nil {
+			continue
+		}
+		if !id.Valid {
+			continue
+		}
+		if _, ok := used[id.Int64]; ok {
+			// 根据 ID 去重
+			continue
+		}
+		used[id.Int64] = struct{}{}
 
-        n := strings.TrimSpace(name.String)
-        if n == "" {
-            n = strconv.FormatInt(id.Int64, 10)
-        }
-        display := fmt.Sprintf("%s（%d）", n, id.Int64)
+		n := strings.TrimSpace(name.String)
+		if n == "" {
+			n = strconv.FormatInt(id.Int64, 10)
+		}
+		display := fmt.Sprintf("%s（%d）", n, id.Int64)
 
-        out = append(out, map[string]interface{}{"id": id.Int64, "name": display})
-    }
-    ok(w, r, out)
+		out = append(out, map[string]interface{}{"id": id.Int64, "name": display})
+	}
+	ok(w, r, out)
 }