fix: operation logs page display and API pagination

- Fix frontend Logs.vue to use correct field names (entity_type, entity_name, old_value, new_value)
- Add user and source_ip columns to logs table
- Add details column showing old_value -> new_value transitions
- Fix backend logs API to support pagination (page, page_size, search)
- Add search support across all log fields (action, entity_type, entity_name, username, values)
- Return proper {list, total, page, page_size} response format

server/handlers/logs.go

@@ -3,6 +3,7 @@ package handlers
 import (
 	"database/sql"
 	"net/http"
+	"strconv"
 
 	"github.com/gin-gonic/gin"
 	"lan-manager/server/db"
@@ -18,17 +19,55 @@ func NewLogHandler() *LogHandler {
 func (h *LogHandler) List(c *gin.Context) {
 	action := c.Query("action")
 	date := c.Query("date")
+	search := c.Query("search")
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+	if page < 1 {
+		page = 1
+	}
+	if pageSize < 1 || pageSize > 100 {
+		pageSize = 20
+	}
+	offset := (page - 1) * pageSize
+
+	// Build count query
+	countQuery := `SELECT COUNT(*) FROM operation_logs WHERE 1=1`
+	countArgs := []interface{}{}
+
+	// Build data query
 	query := `SELECT id, action, entity_type, entity_id, entity_name, old_value, new_value, source_ip, username, created_at FROM operation_logs WHERE 1=1`
 	args := []interface{}{}
+
 	if action != "" {
+		countQuery += ` AND action = ?`
 		query += ` AND action = ?`
+		countArgs = append(countArgs, action)
 		args = append(args, action)
 	}
 	if date != "" {
+		countQuery += ` AND DATE(created_at) = ?`
 		query += ` AND DATE(created_at) = ?`
+		countArgs = append(countArgs, date)
 		args = append(args, date)
 	}
-	query += ` ORDER BY created_at DESC LIMIT 1000`
+	if search != "" {
+		searchPattern := "%" + search + "%"
+		countQuery += ` AND (action LIKE ? OR entity_type LIKE ? OR entity_name LIKE ? OR username LIKE ? OR old_value LIKE ? OR new_value LIKE ?)`
+		query += ` AND (action LIKE ? OR entity_type LIKE ? OR entity_name LIKE ? OR username LIKE ? OR old_value LIKE ? OR new_value LIKE ?)`
+		countArgs = append(countArgs, searchPattern, searchPattern, searchPattern, searchPattern, searchPattern, searchPattern)
+		args = append(args, searchPattern, searchPattern, searchPattern, searchPattern, searchPattern, searchPattern)
+	}
+
+	// Get total count
+	var total int
+	if err := db.DB.QueryRow(countQuery, countArgs...).Scan(&total); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Get data with pagination
+	query += ` ORDER BY created_at DESC LIMIT ? OFFSET ?`
+	args = append(args, pageSize, offset)
 
 	rows, err := db.DB.Query(query, args...)
 	if err != nil {
@@ -36,6 +75,7 @@ func (h *LogHandler) List(c *gin.Context) {
 		return
 	}
 	defer rows.Close()
+
 	logs := []models.OperationLog{}
 	for rows.Next() {
 		var l models.OperationLog
@@ -47,5 +87,11 @@ func (h *LogHandler) List(c *gin.Context) {
 			logs = append(logs, l)
 		}
 	}
-	c.JSON(http.StatusOK, logs)
+
+	c.JSON(http.StatusOK, gin.H{
+		"list":  logs,
+		"total": total,
+		"page":  page,
+		"page_size": pageSize,
+	})
 }

web/src/views/Logs.vue

@@ -29,18 +29,26 @@
             </el-tag>
           </template>
         </el-table-column>
-        <el-table-column prop="target_type" label="对象" width="100">
+        <el-table-column prop="entity_type" label="对象" width="100">
           <template #default="{ row }">
-            <el-tag size="small" effect="plain" round>{{ row.target_type }}</el-tag>
+            <el-tag size="small" effect="plain" round>{{ row.entity_type }}</el-tag>
           </template>
         </el-table-column>
-        <el-table-column prop="target_name" label="对象名称" min-width="160">
+        <el-table-column prop="entity_name" label="对象名称" min-width="160">
           <template #default="{ row }">
             <el-icon :size="12" color="var(--accent)"><Monitor /></el-icon>
-            {{ row.target_name }}
+            {{ row.entity_name }}
           </template>
         </el-table-column>
-        <el-table-column prop="details" label="详情" min-width="240" show-overflow-tooltip />
+        <el-table-column label="详情" min-width="240" show-overflow-tooltip>
+          <template #default="{ row }">
+            <span v-if="row.old_value">{{ row.old_value }} → {{ row.new_value }}</span>
+            <span v-else-if="row.new_value">{{ row.new_value }}</span>
+            <span v-else>-</span>
+          </template>
+        </el-table-column>
+        <el-table-column prop="username" label="用户" width="100" />
+        <el-table-column prop="source_ip" label="来源IP" width="130" />
         <el-table-column prop="created_at" label="时间" width="170">
           <template #default="{ row }">
             <el-icon :size="10"><Clock /></el-icon>