fix: golangci-lint 零告警通过 (57→0) + gofumpt/goimports 全量格式化

## CI 修复 (P0/P1)

P0 — 编译阻塞:
  - interfaces.go: postUseCase ISP 接口移除不用的 Create/Update/Delete

P1 — 必须修复:
  - ST1000: 为 13 个包添加包注释 (common/config/model/service/...)
  - ST1005: redis_store.go 全部错误消息改为小写开头
  - errcheck (19处): defer Close()→闭包忽略, notifier.Create→_=, r.Run→检查error
  - errorlint (9处): switch-on-error→errors.Is 链, ==→errors.Is
  - ST1020/ST1022: 导出符号注释以符号名开头

P2 — 安全评审:
  - gosec (12处): G203/G301/G304/G306 添加 nolint 注释并附理由

P3 — 清理:
  - unused: 移除 hasUnicode/energyStore/current/energyAdminUseCase
  - gofumpt + goimports 全量格式化 (35+ 文件)

internal/controller/space_controller.go

@@ -11,9 +11,9 @@ import (
 
 // SpaceController 用户空间控制器（统一页面：文章/关注/粉丝/收藏/设置）
 type SpaceController struct {
-	spaceService  spaceUseCase
-	followSvc     followUseCase
-	favoriteSvc   favoriteUseCaseForSpace
+	spaceService spaceUseCase
+	followSvc    followUseCase
+	favoriteSvc  favoriteUseCaseForSpace
 }
 
 // NewSpaceController 构造函数
@@ -73,25 +73,29 @@ func (ctrl *SpaceController) ShowSpace(c *gin.Context) {
 
 	// 分页参数
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	if page < 1 { page = 1 }
+	if page < 1 {
+		page = 1
+	}
 	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "18"))
-	if pageSize < 1 || pageSize > 50 { pageSize = 18 }
+	if pageSize < 1 || pageSize > 50 {
+		pageSize = 18
+	}
 
 	// 构建基础数据（含用户统计）
 	postCount, _ := ctrl.spaceService.CountUserPosts(uint(uid))
 	totalLikes, totalFavorites, totalReads, _ := ctrl.spaceService.GetUserStats(uint(uid))
 
 	data := gin.H{
-		"Title":         spaceUser.Username + " 的空间",
-		"SpaceUser":     spaceUser,
-		"IsOwnSpace":    isOwnSpace,
-		"ActiveTab":     tab,
-		"CurrentUID":    currentUID,
-		"ExtraCSS":      "/static/css/space.css",
-		"PostCount":     postCount,
-		"TotalLikes":    totalLikes,
+		"Title":          spaceUser.Username + " 的空间",
+		"SpaceUser":      spaceUser,
+		"IsOwnSpace":     isOwnSpace,
+		"ActiveTab":      tab,
+		"CurrentUID":     currentUID,
+		"ExtraCSS":       "/static/css/space.css",
+		"PostCount":      postCount,
+		"TotalLikes":     totalLikes,
 		"TotalFavorites": totalFavorites,
-		"TotalReads":    totalReads,
+		"TotalReads":     totalReads,
 	}
 
 	// ---- 根据 Tab 加载对应数据 ----