feat: account pool per tool with groups and a Cursor pool; update runs in the background

- The update dialog can be closed while an update applies: it keeps running,
  the page still reloads itself when the new server is up, and a failure
  re-opens the dialog with its error.
- Account pool card: one tab per AI tool (Claude Code, Codex, Cursor CLI,
  Oh My Pi, and every other installed tool, which says it has no pool),
  accounts as cards with 5-hour and weekly quota shown as what is LEFT plus
  their reset times, and the saved profiles of Settings → AI tools →
  Profiles as cards with "Share to pool".
- Cursor account pool (server/lib/cursor-pool.js): Cursor API keys handed to
  a cursor-agent pane only through tmux -e CURSOR_API_KEY;
  `agenthub accounts add <name> --tool cursor`.
- Pool groups (server/lib/pool-groups.js, /api/accounts/groups): a group's
  members run only on its accounts of each tool, a user in no group on the
  accounts no group lists, a pin still wins. account_pins loses its tool
  CHECK (rebuilt, pins kept); three new tables.
- Oh My Pi login sharing can be switched from its pool tab too.

client/src/pages/__tests__/Administration.test.tsx

@@ -84,7 +84,15 @@ vi.mock("../../lib/api", async (importOriginal) => {
     api: {
       ...api,
       lanes: { list: vi.fn(async () => ({ lanes: [], counts: {} })) },
-      accountPool: { list: vi.fn(async () => ({ accounts: [], codex: [], blockPercent: 90 })) },
+      accountPool: {
+        list: vi.fn(async () => ({ accounts: [], codex: [], blockPercent: 90 })),
+        profiles: vi.fn(async () => ({ profiles: [] })),
+      },
+      aiTools: {
+        list: vi.fn(async () => ({ tools: [], default: null })),
+        ompSharing: vi.fn(async () => ({ available: false })),
+        iconUrl: (id: string) => `/api/ai-tools/${id}/icon`,
+      },
     },
   };
 });

client/src/pages/__tests__/Users.test.tsx

@@ -54,6 +54,12 @@ vi.mock("../../lib/api", async (importOriginal) => {
       lanes: { list: vi.fn(async () => ({ lanes: [], counts: {} })) },
       accountPool: {
         list: vi.fn(async () => ({ accounts: [], codex: [], blockPercent: 90 })),
+        profiles: vi.fn(async () => ({ profiles: [] })),
+      },
+      aiTools: {
+        list: vi.fn(async () => ({ tools: [], default: null })),
+        ompSharing: vi.fn(async () => ({ available: false })),
+        iconUrl: (id: string) => `/api/ai-tools/${id}/icon`,
       },
     },
   };