feat(publish): require cover image for WeChat Official Account

WeChat 公众号在管理员/运营者授权发布场景下需要 2.35:1 封面，
新增共享 publishPlatformRequiresCover 校验并同步前端封面要求与文案，
避免在调度与即时发布两条路径上重复维护平台名单。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/i18n/messages/en-US.ts

@@ -1101,7 +1101,7 @@ const enUS = {
     previewHintLocked: "A selected platform requires a fixed cover ratio, so the cover will be exported using the current platform requirement.",
     previewHintFree: "There is no forced cover ratio right now. You can upload the original image directly or adjust framing before confirming.",
     requirementsTitle: "Platform requirements",
-    requirementsHint: "Requirements switch automatically based on the selected publish platforms. Baijiahao and Dongchedi require a cover image.",
+    requirementsHint: "Requirements switch automatically based on the selected publish platforms. WeChat Official Account, Baijiahao, and Dongchedi require a cover image.",
     recommendedRatio: "Recommended ratio",
     recommendedSize: "Recommended size",
     required: "Required",

apps/admin-web/src/i18n/messages/zh-CN.ts

@@ -1110,7 +1110,7 @@ const zhCN = {
     previewHintLocked: "已选择需要固定封面比例的平台，确认时会按当前平台要求输出封面。",
     previewHintFree: "当前不限制封面比例，可直接上传原图；如需调整也可拖拽缩放后再确认。",
     requirementsTitle: "平台封面要求",
-    requirementsHint: "会根据当前选中的发布平台自动切换要求，百家号和懂车帝为强制上传。",
+    requirementsHint: "会根据当前选中的发布平台自动切换要求，微信公众号、百家号和懂车帝为强制上传。",
     recommendedRatio: "推荐比例",
     recommendedSize: "推荐尺寸",
     required: "必传",

apps/admin-web/src/lib/cover-requirements.ts

@@ -24,6 +24,15 @@ const defaultRequirement = {
 };
 
 const requirementCatalog: Record<string, Partial<PlatformCoverRequirement>> = {
+  weixin_gzh: {
+    required: true,
+    supportMode: "native",
+    aspectRatio: 2.35,
+    aspectLabel: "2.35:1",
+    outputWidth: 1200,
+    outputHeight: 511,
+    priority: 110,
+  },
   baijiahao: {
     required: true,
     supportMode: "native",

server/internal/tenant/app/media_service.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/rand"
 	"encoding/hex"
+	"strings"
 	"time"
 
 	"github.com/jackc/pgx/v5/pgxpool"
@@ -136,13 +137,22 @@ func (s *MediaService) listArticlePublishRecords(ctx context.Context, tenantID,
 
 func publishBatchRequiresCover(accounts []platformAccountSeed) bool {
 	for _, account := range accounts {
-		if account.PlatformID == "baijiahao" || account.PlatformID == "dongchedi" {
+		if publishPlatformRequiresCover(account.PlatformID) {
 			return true
 		}
 	}
 	return false
 }
 
+func publishPlatformRequiresCover(platformID string) bool {
+	switch strings.TrimSpace(platformID) {
+	case "weixin_gzh", "baijiahao", "dongchedi":
+		return true
+	default:
+		return false
+	}
+}
+
 func pointerStringValue(value *string) string {
 	if value == nil {
 		return ""

server/internal/tenant/app/publish_job_service.go

@@ -162,7 +162,7 @@ func (s *PublishJobService) Create(ctx context.Context, actor auth.Actor, req Cr
 		accountSeeds = append(accountSeeds, *target.accountSeed)
 	}
 	if publishBatchRequiresCover(accountSeeds) && strings.TrimSpace(pointerStringValue(articleMeta.CoverAssetURL)) == "" {
-		return nil, response.ErrBadRequest(40044, "publish_cover_required", "baijiahao publishing requires a cover image")
+		return nil, response.ErrBadRequest(40044, "publish_cover_required", "selected publishing platform requires a cover image")
 	}
 
 	publishBatchID, publishRecordIDs, err := createPublishBatchRecords(

server/internal/tenant/app/publish_platforms_test.go

@@ -0,0 +1,30 @@
+package app
+
+import "testing"
+
+func TestPublishPlatformRequiresCover(t *testing.T) {
+	t.Parallel()
+
+	for _, platformID := range []string{"weixin_gzh", "baijiahao", "dongchedi"} {
+		if !publishPlatformRequiresCover(platformID) {
+			t.Fatalf("publishPlatformRequiresCover(%q) = false, want true", platformID)
+		}
+	}
+
+	if publishPlatformRequiresCover("zhihu") {
+		t.Fatal("publishPlatformRequiresCover(\"zhihu\") = true, want false")
+	}
+}
+
+func TestPublishCoverRequirementCallersIncludeWeixinGzh(t *testing.T) {
+	t.Parallel()
+
+	accounts := []platformAccountSeed{{PlatformID: "weixin_gzh"}}
+	if !publishBatchRequiresCover(accounts) {
+		t.Fatal("publishBatchRequiresCover() = false for weixin_gzh, want true")
+	}
+
+	if !schedulePublishPlatformsRequireCover([]string{"weixin_gzh"}) {
+		t.Fatal("schedulePublishPlatformsRequireCover() = false for weixin_gzh, want true")
+	}
+}

server/internal/tenant/app/schedule_task_service.go

@@ -564,8 +564,7 @@ func (s *ScheduleTaskService) loadPublishAccountPlatformIDs(ctx context.Context,
 
 func schedulePublishPlatformsRequireCover(platformIDs []string) bool {
 	for _, platformID := range platformIDs {
-		switch strings.TrimSpace(platformID) {
-		case "baijiahao", "dongchedi":
+		if publishPlatformRequiresCover(platformID) {
 			return true
 		}
 	}