refactor: 拆分 llm.go(526行) 为三文件(llm.go配置/llm_chat.go对话流式/llm_history.go历史),符合400行handler规范

backend/internal/api/handlers/llm_history.go

@@ -0,0 +1,41 @@
+package handlers
+
+import (
+	"net/http"
+
+	"ezops/internal/api/middleware"
+	"ezops/internal/models"
+
+	"github.com/gin-gonic/gin"
+)
+
+// GetChatHistory 获取当前用户的对话历史（按时间正序，仅返回最近 100 条避免过大） // Logan.Li
+// GET /api/v1/aiops/chat-history
+func (h *LLMHandler) GetChatHistory(c *gin.Context) {
+	uid := middleware.GetUserID(c)
+	var rows []models.ChatHistory
+	// 子查询取最近 100 条后再正序返回，保证前端渲染顺序正确 // Logan.Li
+	h.db.Where("user_id = ?", uid).
+		Order("id DESC").
+		Limit(100).
+		Find(&rows)
+	// 反转为时间正序（最早在前）
+	for i, j := 0, len(rows)-1; i < j; i, j = i+1, j-1 {
+		rows[i], rows[j] = rows[j], rows[i]
+	}
+	c.JSON(http.StatusOK, models.Response{Code: 200, Data: gin.H{
+		"list":  rows,
+		"total": len(rows),
+	}})
+}
+
+// ClearChatHistory 清空当前用户的对话历史 // Logan.Li
+// DELETE /api/v1/aiops/chat-history
+func (h *LLMHandler) ClearChatHistory(c *gin.Context) {
+	uid := middleware.GetUserID(c)
+	if err := h.db.Where("user_id = ?", uid).Delete(&models.ChatHistory{}).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "清除失败: " + err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "对话历史已清空"})
+}