feat(knowledge): 图片上传接口（S3 存储，限 5MB jpg/png/webp）

server-go/internal/handler/knowledge.go

@@ -5,13 +5,14 @@ import (
 
 	"silk-server-go/internal/middleware"
 	"silk-server-go/internal/model"
+	"silk-server-go/internal/service"
 
 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
 )
 
 // RegisterKnowledgeRoutes 注册知识库路由
-func RegisterKnowledgeRoutes(rg *gin.RouterGroup, db *gorm.DB) {
+func RegisterKnowledgeRoutes(rg *gin.RouterGroup, db *gorm.DB, s3 *service.S3Service, imageBucket string) {
 	read := middleware.RequirePermission(db, "knowledge:read")
 	write := middleware.RequirePermission(db, "knowledge:write")
 
@@ -26,6 +27,8 @@ func RegisterKnowledgeRoutes(rg *gin.RouterGroup, db *gorm.DB) {
 	rg.POST("/knowledge/articles", write, createArticle(db))
 	rg.PATCH("/knowledge/articles/:id", write, updateArticle(db))
 	rg.DELETE("/knowledge/articles/:id", write, deleteArticle(db))
+
+	registerKnowledgeImageRoute(rg, db, s3, imageBucket)
 }
 
 // listDiseases 蚕病百科列表（支持 category/keyword/enabled 过滤）