feat(admin): gate project surfaces behind permission grants for members

The org admin SPA was org-admin only: every project route used
requireOrgRole, so a plain MEMBER could not reach the projects they held
a project grant on, and an org OWNER/ADMIN could mutate any project
without holding the project's `manage` grant. That contradicts ADR-0004
(spec `Permission.lean`): org role is not a project authorization root,
and the only out-of-role override is platform-admin force-release
(`RequiresAdmin`), not org admin.

Add `requireProjectPermission` (guards.ts): resolve any org member, bind
the project to their org, then check the PermissionGrant authorizer.
`allowOrgAdminOversight=true` lets OWNER/ADMIN through for *read*
oversight only; mutations pinned to `collaborator.manage`
(grant/revoke team-access) pass `allowOrgAdminOversight=false`, so an org
admin still needs the project MANAGE grant to mutate access. The project
detail GET now also returns `actorIsOrgAdmin` and `actorCanManageProject`
so the SPA can render mutation controls only for entitled actors.

Add a member-facing project surface:
- `GET /api/org/:orgSlug/my-projects` + `listMyProjects` resolve the
  actor's principals and return the projects with a READ+ grant.
- The SPA routes members (non-admin) to the projects page instead of the
  admin overview, renders a member project shell on project routes, shows
  a `我的项目` list for members and the full folder explorer for admins.
- The project detail page gates rename/archive/bind/sessions behind org
  admin and the grant/revoke UI behind `actorCanManageProject`.
- The denied panel now points members at their authorized projects.

Update admin-members-teams integration test: seed the owner with a MANAGE
grant on the test project so the org-owner flow still passes the new
project-level gate on team-access grant/revoke.

hub/admin-web/src/lib/api.ts

@@ -122,6 +122,8 @@ export interface ProjectDetail {
 	archivedAt: string | null;
 	createdBy: { id: string; displayName: string; feishuOpenId: string } | null;
 	binding: { chatId: string; createdAt: string } | null;
+	actorIsOrgAdmin?: boolean;
+	actorCanManageProject?: boolean;
 }
 
 export interface TeamAccessEntry {
@@ -259,6 +261,8 @@ export const api = {
 		post(`${orgBase(slug)}/teams/${teamId}/members/${userId}/revoke`),
 
 	explorer: (slug: string) => get(`${orgBase(slug)}/explorer`) as Promise<ExplorerData>,
+	myProjects: (slug: string) =>
+		get(`${orgBase(slug)}/my-projects`) as Promise<{ projects: ExplorerProject[] }>,
 	createFolder: (slug: string, body: { name: string; parentId?: string; sortKey?: string }) =>
 		post(`${orgBase(slug)}/folders`, body) as Promise<{
 			id: string;