feat(space): 桌面端空间成员管理界面 —— 补齐"临时组队协作"前端闭环

此前能建项目空间/切换/启用全员空间，但邀请队友进空间只有后端 API、无界面，
协作故事前端断了一半。本次补上成员管理 UI，让 Space 协作端到端可用。

- api.ts: spaceMembers/addSpaceMember/setSpaceMemberRole/removeSpaceMember + SpaceMemberInfo
- SpaceMembers 弹窗: 列成员(名/邮箱/角色 badge); 空间 admin/owner 可邀请(邮箱+角色)/
  下拉改角色/移除, owner 受保护(无下拉/移除); 非管理员只读提示。复用 Dialog/Button/Select
- 顶栏加"管理成员"入口(UserCog): 活跃空间为 project/tenant 时显示; App 管弹窗开关，
  传 spaceId/spaceName/canManage(空间角色 admin/owner)/selfUserId

实机验证(Wails 桌面 + 全栈后端): demospace(owner)在项目空间邀请 teammate → 成员列表
即时出现(切换器 1人→2人) → 下拉改 teammate 成员→管理员(服务端确认 owner/admin) →
owner 自身受保护无改删入口。tsc + 48 前端测试通过。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-desktop/frontend/src/App.tsx

@@ -4,6 +4,7 @@ import { LayoutDashboard, Workflow, Database, FileText, Activity, Bookmark, Boxe
 import { TopBar } from "./shell/TopBar";
 import { LeftNav, type ViewKey } from "./shell/LeftNav";
 import { ApprovalBar } from "./shell/ApprovalBar";
+import { SpaceMembers } from "./shell/SpaceMembers";
 import { StudioView } from "./studio/StudioView";
 import { MemoryView } from "./views/MemoryView";
 import { KbView } from "./views/KbView";
@@ -50,6 +51,7 @@ export default function App() {
   const identity = useMemo<Identity>(() => ({ userId: user?.id ?? "", sessionId: getSessionId() }), [user]);
   const [run, setRun] = useState<RunState>(emptyRun);
   const [cmdOpen, setCmdOpen] = useState(false);
+  const [membersOpen, setMembersOpen] = useState(false);
   const closeRef = useRef<(() => void) | null>(null);
 
   const execCloseRef = useRef<(() => void) | null>(null);
@@ -298,7 +300,7 @@ export default function App() {
         style={{ background: "radial-gradient(60% 100% at 50% 0%, rgba(124,92,246,0.10), transparent 70%)" }}
       />
       <UpdateBanner />
-      <TopBar user={user} tenant={tenant} tenants={tenants} onSwitchTenant={onSwitchTenant} space={space} spaces={spaces} onSwitchSpace={onSwitchSpace} onCreateSpace={onCreateSpace} onEnableTenantSpace={onEnableTenantSpace} tenantRole={tenant?.role ?? ""} onLogout={onLogout} onCommand={() => setCmdOpen(true)} onOpenUsage={() => setView("usage")} />
+      <TopBar user={user} tenant={tenant} tenants={tenants} onSwitchTenant={onSwitchTenant} space={space} spaces={spaces} onSwitchSpace={onSwitchSpace} onCreateSpace={onCreateSpace} onEnableTenantSpace={onEnableTenantSpace} onManageMembers={() => setMembersOpen(true)} tenantRole={tenant?.role ?? ""} onLogout={onLogout} onCommand={() => setCmdOpen(true)} onOpenUsage={() => setView("usage")} />
       <ApprovalBar run={run} />
       <div className="relative flex min-h-0 flex-1">
         <LeftNav active={view} onSelect={setView} />
@@ -323,6 +325,14 @@ export default function App() {
         </main>
       </div>
       <CommandPalette open={cmdOpen} onClose={() => setCmdOpen(false)} commands={commands} />
+      <SpaceMembers
+        open={membersOpen}
+        onClose={() => setMembersOpen(false)}
+        spaceId={space?.space?.id ?? ""}
+        spaceName={space?.space?.kind === "personal" ? "个人空间" : space?.space?.name ?? ""}
+        canManage={space?.role === "owner" || space?.role === "admin"}
+        selfUserId={user?.id ?? ""}
+      />
     </div>
     </ToastProvider>
   );