feat(settings): every AI tool's login profiles in one Settings section, linked to the account pool

Settings → AI tools → Profiles holds one tab per tool: Claude Code (the
cc-profiles panel, moved out of the Claude Code page's modal — its button
now links here), Codex (the whole $CODEX_HOME/auth.json) and Oh My Pi
(`omp auth export` / `omp auth import -`, secrets on stdin; omp's credential
tables are emptied first because import merges, and a failed import puts
the outgoing set back). Antigravity is listed as not switchable: agy keeps
its login in the OS keyring.

server/lib/tool-profiles.js + /api/tool-profiles keep cc-profiles' rules
(one login = one profile, the outgoing login is re-saved before a switch,
an unsaved one refuses it, the live login's profile is not deletable) and
never return a token; /tool-profiles joins ADMIN_WRITE_PREFIXES and
STAFF_ONLY_PREFIXES, writes are same-origin only.

The account pool takes a saved Codex profile too (moved in like a Claude
one, GET /api/accounts/profiles?tool=codex). Each Claude/Codex profile has
a "Move to pool" link (/admin?poolAdd=&poolProfile= opens the pool's Add
dialog on it), Settings shows the pool's size, and the pool card links back.

server/__tests__/claude-pool-login.test.js

@@ -338,6 +338,42 @@ describe("moving a saved profile in from the Users page", () => {
     pool.removeAccount("work");
   });
 
+  it("moves a saved Codex profile in, and lists Codex profiles without a token", async () => {
+    const dir = path.join(TMP, ".claude", "agenthub-profiles", "codex");
+    fs.mkdirSync(dir, { recursive: true });
+    const idToken = `x.${Buffer.from(JSON.stringify({ email: "cx@example.com" })).toString("base64url")}.s`;
+    fs.writeFileSync(
+      path.join(dir, "cx.json"),
+      JSON.stringify({
+        name: "cx",
+        label: "Codex work",
+        secret: {
+          tokens: {
+            id_token: idToken,
+            access_token: "at-cx",
+            refresh_token: "rt-cx",
+            account_id: "a-cx",
+          },
+        },
+      })
+    );
+    const list = await call("GET", "/api/accounts/profiles?tool=codex");
+    assert.deepEqual(
+      list.body.profiles.map((p) => [p.name, p.label, p.email]),
+      [["cx", "Codex work", "cx@example.com"]]
+    );
+    assert.ok(!JSON.stringify(list.body).includes("rt-cx"));
+    const moved = await call("POST", "/api/accounts", {
+      tool: "codex",
+      profile: "cx",
+      currentPassword: "admin-pass-1",
+    });
+    assert.equal(moved.status, 201);
+    assert.equal(moved.body.account.kind, "chatgpt");
+    assert.equal(fs.existsSync(path.join(dir, "cx.json")), false, "the pool is its one holder");
+    require("../lib/codex-pool").removeAccount("cx");
+  });
+
   it("takes a pasted .credentials.json once Anthropic names its account", async () => {
     const pasted = oauth("p");
     owners[pasted.accessToken] = { uuid: "uuid-pasted", email: "p@example.com" };