refactor: 文件行数超标拆解（Service + Controller 9/16 完成）

- Service 层：energy_service → energize/operations/admin/query 四文件
- Service 层：post_service → helpers/audit + 核心 CRUD 保留
- Service 层：favorite_service → items + 核心文件夹操作保留
- Service 层：auth_service → password + 核心注册/登录保留
- Service 层：notification_service → notify + 核心列表/已读保留
- Service 层：audit_service → review + 核心列表/详情保留
- Controller 层：studio_controller → page/write/api/post_api/action 五文件
- Controller 层：post_controller → page/api/upload 三文件
- Controller 层：comment_controller → list/write/action/upload 四文件
- 清理未使用导入（notification_service.go 移除 fmt）

internal/controller/comment_write_controller.go

@@ -0,0 +1,72 @@
+package controller
+
+import (
+	"net/http"
+	"strconv"
+
+	"metazone.cc/metalab/internal/common"
+
+	"github.com/gin-gonic/gin"
+)
+
+// CreateRoot POST /api/posts/:id/comments
+func (ctrl *CommentController) CreateRoot(c *gin.Context) {
+	uid, _, ok := common.GetGinUser(c)
+	if !ok {
+		common.Error(c, http.StatusUnauthorized, "请先登录")
+		return
+	}
+
+	postID, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的文章ID")
+		return
+	}
+
+	var req struct {
+		Body string `json:"body" binding:"required"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		common.Error(c, http.StatusBadRequest, "请输入评论内容")
+		return
+	}
+
+	comment, err := ctrl.commentService.CreateRoot(uid, uint(postID), req.Body)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, err.Error())
+		return
+	}
+
+	common.Ok(c, comment)
+}
+
+// CreateReply POST /api/comments/:id/reply
+func (ctrl *CommentController) CreateReply(c *gin.Context) {
+	uid, _, ok := common.GetGinUser(c)
+	if !ok {
+		common.Error(c, http.StatusUnauthorized, "请先登录")
+		return
+	}
+
+	parentID, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的评论ID")
+		return
+	}
+
+	var req struct {
+		Body string `json:"body" binding:"required"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		common.Error(c, http.StatusBadRequest, "请输入回复内容")
+		return
+	}
+
+	reply, err := ctrl.commentService.CreateReply(uid, uint(parentID), req.Body)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, err.Error())
+		return
+	}
+
+	common.Ok(c, reply)
+}