合并分享链路重构到主分支

合入通用作品分享卡片与小程序直达路径
合入推荐页当前作品系统分享参数同步
合入小程序九宫切图与相关测试

# Conflicts:
#	.hermes/shared-memory/decision-log.md
#	docs/【开发运维】本地开发验证与生产运维-2026-05-15.md
#	docs/【玩法创作】平台入口与玩法链路-2026-05-15.md
#	src/components/custom-world-home/CustomWorldCreationHub.tsx
#	src/components/platform-entry/PlatformEntryFlowShellImpl.test.ts
#	src/components/platform-entry/PlatformEntryFlowShellImpl.tsx
#	src/components/rpg-entry/RpgEntryHomeView.tsx

src/services/wechatMiniProgramShareTarget.ts

@@ -0,0 +1,60 @@
+import { isWechatMiniProgramWebViewRuntime } from './authService';
+
+const MESSAGE_TYPE = 'genarrative:share-target';
+
+export type WechatMiniProgramShareTarget = {
+  targetPath: '/works/detail';
+  work: string;
+  title?: string | null;
+};
+
+function normalizeShareTarget(
+  target: WechatMiniProgramShareTarget | null | undefined,
+) {
+  const work = target?.work?.trim() ?? '';
+  if (!work) {
+    return null;
+  }
+
+  return {
+    targetPath: '/works/detail' as const,
+    work,
+    title: target?.title?.trim() || undefined,
+  };
+}
+
+export function buildWechatMiniProgramShareTargetMessage(
+  target: WechatMiniProgramShareTarget | null | undefined,
+) {
+  const normalizedTarget = normalizeShareTarget(target);
+  return normalizedTarget
+    ? {
+        type: MESSAGE_TYPE,
+        payload: normalizedTarget,
+      }
+    : null;
+}
+
+export function postWechatMiniProgramShareTarget(
+  target: WechatMiniProgramShareTarget | null | undefined,
+) {
+  if (
+    typeof window === 'undefined' ||
+    !isWechatMiniProgramWebViewRuntime() ||
+    typeof window.wx?.miniProgram?.postMessage !== 'function'
+  ) {
+    return false;
+  }
+
+  const message = buildWechatMiniProgramShareTargetMessage(target);
+  if (!message) {
+    return false;
+  }
+
+  // 中文注释：微信 web-view 会在分享等时机把 postMessage 数据交给原生页，
+  // 小程序页据此把右上角系统分享指向当前推荐作品。
+  window.wx.miniProgram.postMessage({
+    data: message,
+  });
+  return true;
+}