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/router/deps_extra.go

@@ -131,25 +131,25 @@ func buildDeps(db *gorm.DB, cfg *config.Config, siteSettings *config.SiteSetting
 		studioCtrl:    studioCtrl,
 		adminPostCtrl: adminPostCtrl,
 		adminCtrl:     adminController, auditCtrl: auditController,
-		siteSettingCtrl: siteSettingController,
-		levelCtrl:       levelCtrl,
-		energyCtrl:      energyCtrl,
-		adminEnergyCtrl: adminEnergyCtrl,
-		energyService:   energyService,
-		commentCtrl:     commentCtrl,
-		commentService:  commentService,
-		adminCommentCtrl: adminCommentCtrl,
-		reactionCtrl:    reactionCtrl,
-		followCtrl:      followCtrl,
-		favoriteCtrl:    favoriteCtrl,
-		favoriteService: favoriteService,
-		trendsService:      trendsService,
-		homeCache:          homeCache,
+		siteSettingCtrl:     siteSettingController,
+		levelCtrl:           levelCtrl,
+		energyCtrl:          energyCtrl,
+		adminEnergyCtrl:     adminEnergyCtrl,
+		energyService:       energyService,
+		commentCtrl:         commentCtrl,
+		commentService:      commentService,
+		adminCommentCtrl:    adminCommentCtrl,
+		reactionCtrl:        reactionCtrl,
+		followCtrl:          followCtrl,
+		favoriteCtrl:        favoriteCtrl,
+		favoriteService:     favoriteService,
+		trendsService:       trendsService,
+		homeCache:           homeCache,
 		announcementService: announcementService,
-		announcementCtrl:   announcementCtrl,
-		categoryCtrl:       categoryCtrl,
-		categoryService:    categoryService,
-		tagCtrl:            tagCtrl,
-		tagService:         tagService,
+		announcementCtrl:    announcementCtrl,
+		categoryCtrl:        categoryCtrl,
+		categoryService:     categoryService,
+		tagCtrl:             tagCtrl,
+		tagService:          tagService,
 	}
 }