feat: 编写swagger注释并生成文档

backend/handlers/graph_handler.go

@@ -17,11 +17,23 @@ func NewGraphHandler(service services.GraphService) *GraphHandler {
 	}
 }
 
+// @Summary 获取图数据
+// @Description 获取知识图谱的全部节点和边数据
+// @Produce json
+// @Success 200 {object} models.GraphData "成功"
+// @Failure 500 {object} models.ErrorResponse "内部错误"
+// @Router /api/graph [get]
 func (h *GraphHandler) GetGraphData(c *gin.Context) {
 	data := h.service.GetGraphData()
 	c.JSON(http.StatusOK, data)
 }
 
+// @Summary 获取图统计信息
+// @Description 获取知识图谱的节点数、边数等统计信息
+// @Produce json
+// @Success 200 {object} map[string]interface{} "成功"
+// @Failure 500 {object} models.ErrorResponse "内部错误"
+// @Router /api/graph/stats [get]
 func (h *GraphHandler) GetStats(c *gin.Context) {
 	stats := h.service.GetStats()
 	c.JSON(http.StatusOK, gin.H{