refactor: 按go modules规范重构

backend/internal/handler/graph_handler.go

@@ -0,0 +1,51 @@
+package handler
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"knowledge-graph-backend/internal/service"
+)
+
+type GraphHandler struct {
+	service service.GraphService
+}
+
+func NewGraphHandler(svc service.GraphService) *GraphHandler {
+	return &GraphHandler{
+		service: svc,
+	}
+}
+
+// @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} model.GraphData "成功"
+// @Failure 500 {object} model.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} model.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, stats)
+}
+
+// @Summary 获取简化图数据
+// @Description 获取知识图谱的全部节点和边数据（仅保留核心信息，适合LLM处理）
+// @Produce json
+// @Success 200 {object} model.SimpleGraphData "成功"
+// @Failure 500 {object} model.ErrorResponse "内部错误"
+// @Router /api/graph/simpleJson [get]
+func (h *GraphHandler) GetSimpleGraphData(c *gin.Context) {
+	data := h.service.GetSimpleGraphData()
+	c.JSON(http.StatusOK, data)
+}