refactor: 按go modules规范重构

backend/internal/handler/search_handler.go

@@ -0,0 +1,41 @@
+package handler
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"knowledge-graph-backend/internal/service"
+)
+
+type SearchHandler struct {
+	service service.GraphService
+}
+
+func NewSearchHandler(svc service.GraphService) *SearchHandler {
+	return &SearchHandler{
+		service: svc,
+	}
+}
+
+// @Summary 搜索节点
+// @Description 根据关键词搜索知识图谱中的节点
+// @Produce json
+// @Param q query string true "搜索关键词"
+// @Success 200 {object} model.SearchResponse "成功"
+// @Failure 400 {object} model.ErrorResponse "请求错误"
+// @Failure 500 {object} model.ErrorResponse "内部错误"
+// @Router /api/search [get]
+func (h *SearchHandler) SearchNodes(c *gin.Context) {
+	query := c.Query("q")
+	if query == "" {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error":   "Bad Request",
+			"message": "Query parameter 'q' is required",
+		})
+		return
+	}
+
+	results := h.service.SearchNodes(query)
+
+	c.JSON(http.StatusOK, results)
+}