fix(wechat): repair share preview on disk for sanitized delivery artifacts

Production WeChat delivery strips localPath from artifacts, so share-preview
auto-repair never wrote back to HTML. Resolve paths via publishDir +
relativePath, repair at materialize and delivery prep, and pass h5Root from
Portal so page.generate can patch missing meta before sending links.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/portal-integration-services-bootstrap.mjs

@@ -105,6 +105,7 @@ export async function bootstrapPortalIntegrationServices({
       config: wechatMpConfig,
       userAuth,
       sessionAccess,
+      h5Root,
       htmlDeliveryAuthority:
         typeof mindSpacePublicFinish
           ?.prepareWechatHtmlDelivery ===