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/studio_action_controller.go

@@ -0,0 +1,133 @@
+package controller
+
+import (
+	"log"
+	"net/http"
+	"strconv"
+	"time"
+
+	"metazone.cc/metalab/internal/common"
+
+	"github.com/gin-gonic/gin"
+)
+
+// Delete 删除帖子
+func (ctrl *StudioController) Delete(c *gin.Context) {
+	uid, role, ok := common.GetGinUser(c)
+	if !ok {
+		common.Error(c, http.StatusUnauthorized, "请先登录")
+		return
+	}
+
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
+		return
+	}
+
+	post, getErr := ctrl.postService.GetByID(uint(id))
+	if getErr != nil {
+		common.Error(c, http.StatusNotFound, "帖子不存在")
+		return
+	}
+	if !ctrl.postService.IsPostAccessible(uid, role, post.UserID) {
+		common.Error(c, http.StatusForbidden, "无权操作此帖子")
+		return
+	}
+
+	authorID := post.UserID
+
+	if err := ctrl.postService.Delete(uint(id)); err != nil {
+		common.Error(c, http.StatusInternalServerError, "删除失败")
+		return
+	}
+
+	// 删稿扣作者域能（无视负数，有限重试后静默忽略）
+	if ctrl.energySvc != nil {
+		const maxRetries = 3
+		backoff := 100 * time.Millisecond
+		for i := 0; i < maxRetries; i++ {
+			if err := ctrl.energySvc.DeductOnDeletePost(authorID, uint(id)); err == nil {
+				break
+			}
+			if i < maxRetries-1 {
+				time.Sleep(backoff)
+				backoff *= 2
+			} else {
+				log.Printf("删稿扣域能失败(user=%d, post=%d): %v", authorID, id, err)
+			}
+		}
+	}
+
+	common.OkMessage(c, "删除成功")
+}
+
+// Submit 提交审核
+func (ctrl *StudioController) Submit(c *gin.Context) {
+	uid, role, ok := common.GetGinUser(c)
+	if !ok {
+		common.Error(c, http.StatusUnauthorized, "请先登录")
+		return
+	}
+
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
+		return
+	}
+
+	post, getErr := ctrl.postService.GetByID(uint(id))
+	if getErr != nil {
+		common.Error(c, http.StatusNotFound, "帖子不存在")
+		return
+	}
+	if !ctrl.postService.IsPostAccessible(uid, role, post.UserID) {
+		common.Error(c, http.StatusForbidden, "无权操作此帖子")
+		return
+	}
+
+	if err := ctrl.postService.SubmitForAudit(uint(id)); err != nil {
+		common.Error(c, http.StatusBadRequest, err.Error())
+		return
+	}
+
+	common.OkMessage(c, "已提交审核")
+}
+
+// TrendsAPI 创作中心趋势数据 API GET /api/studio/trends?period=7d|30d|90d
+func (ctrl *StudioController) TrendsAPI(c *gin.Context) {
+	uid, _, ok := common.GetGinUser(c)
+	if !ok {
+		common.Error(c, http.StatusUnauthorized, "请先登录")
+		return
+	}
+
+	if ctrl.trendsSvc == nil {
+		common.Error(c, http.StatusInternalServerError, "趋势服务不可用")
+		return
+	}
+
+	period := c.DefaultQuery("period", "7d")
+	var days int
+	switch period {
+	case "7d":
+		days = 7
+	case "30d":
+		days = 30
+	case "90d":
+		days = 90
+	default:
+		common.Error(c, http.StatusBadRequest, "无效的时间范围，支持 7d/30d/90d")
+		return
+	}
+
+	since := time.Now().AddDate(0, 0, -days).Format("2006-01-02")
+
+	result, err := ctrl.trendsSvc.GetTrends(uid, since)
+	if err != nil {
+		common.Error(c, http.StatusInternalServerError, "获取趋势数据失败")
+		return
+	}
+
+	common.Ok(c, result)
+}