feat(cc-config): update every plugin and marketplace at once, then reload the open sessions

The plugins tab could already update one plugin or one marketplace at a time. It gains an install-wide batch and, separately, the reload step that actually makes an update take effect.

Update all runs in a DETACHED worker rather than the request handler, for a structural reason: the batch ends with the plugin the dashboard ITSELF runs from, and that step's plugin-bootstrap.js --force SIGTERMs this very server. An in-process loop would die partway through with the remaining plugins unrun and nothing left to report. Order is marketplaces (one call, no name = all) -> every other installed plugin -> AgentHub last -> one reload. Each transition is journalled to cc-update-all.json in the runtime dir, outside the plugin cache the update replaces, so whichever server is alive serves progress from it; the POST's response is only an acknowledgement.

readUpdateAll DERIVES an abandoned status for a running journal older than an hour, because a detached worker killed by a reboot leaves nobody to write the terminal entry and the button would stay wedged forever. isRunning gates a concurrent batch: two claude plugin update chains over one config dir race.

Reload is its own capability (server/lib/cc-reload.js, POST /api/cc-config/reload). /reload-plugins and /reload-skills are scoped BY CLAUDE CODE to the session that runs them, so nothing can reload a session from outside - typing into a session already running is the only real mechanism, and that is what this does, over tmux send-keys into the dashboard's live lane panes. It spawns NO claude process on purpose: a one-shot claude -p "/reload-plugins" would reload only its own short-lived session, exit, and leave a junk session in the dashboard's history - a headless run gets a full sessions row and there is no filter anywhere to suppress it. Reusing live panes means no session is created at all. Panes at a shell prompt are skipped (the text would run as a shell command) and only claude lanes are addressed, since Codex has no such command.

Update-all reloads once at the end; updating a single plugin passes reload:true and reloads immediately, and never after a failed action.

Fixes a real pre-existing bug on the way: pluginUpdate omitted -y while runClaude closes stdin, and the CLI requires it whenever stdin is not a TTY - so the per-plugin Update button failed for any plugin whose marketplace declares an install command. Also completes CcConfigChangedPayload's action union, which claimed write|delete while nine other values were already being emitted.

Verified: server 1683/1683, client 486/486 (27 new tests), build, prettier, file-header audit, openapi.yaml regenerated (117 paths). Update all was NOT executed against this machine - it would update 7 real plugins and restart the running dashboard.

client/src/i18n/locales/en/ccConfig.json

@@ -305,6 +305,21 @@
     "copy": "Copy",
     "copied": "Copied"
   },
+  "updateAll": {
+    "title": "Update everything",
+    "help": "Refreshes every marketplace, then updates all installed plugins, then tells the Claude Code sessions this dashboard has open to pick up the changes. AgentHub itself goes last, because updating it restarts this dashboard.",
+    "button": "Update all",
+    "working": "Updating…",
+    "started": "Update-all started for {{count}} plugin(s).",
+    "failed": "Could not start the update.",
+    "reloadButton": "Reload sessions",
+    "reloaded": "Reload sent to {{count}} open session(s).",
+    "reloadedNone": "No open Claude Code session to reload.",
+    "reloadedCount": "— {{count}} session(s)",
+    "restartWarning": "Keep this tab open. If AgentHub itself is updated, the dashboard restarts at the end and this page reconnects on its own.",
+    "abandoned": "The previous batch stopped without finishing — most likely the machine restarted. Run it again.",
+    "bootstrapFailed": "The dashboard was stopped but did not come back: {{error}}. Run /agenthub-update to recover."
+  },
   "manage": {
     "installTitle": "Install a plugin",
     "installPlaceholder": "owner/repo, https://… or plugin@marketplace",

client/src/i18n/locales/vi/ccConfig.json

@@ -300,6 +300,21 @@
     "copy": "Sao chép",
     "copied": "Đã sao chép"
   },
+  "updateAll": {
+    "title": "Cập nhật toàn bộ",
+    "help": "Làm mới mọi marketplace, rồi cập nhật tất cả plugin đã cài, sau đó yêu cầu các session Claude Code mà dashboard đang mở nạp lại thay đổi. AgentHub đứng cuối, vì cập nhật nó sẽ khởi động lại dashboard này.",
+    "button": "Cập nhật tất cả",
+    "working": "Đang cập nhật…",
+    "started": "Đã bắt đầu cập nhật {{count}} plugin.",
+    "failed": "Không khởi động được tiến trình cập nhật.",
+    "reloadButton": "Nạp lại session",
+    "reloaded": "Đã gửi lệnh nạp lại tới {{count}} session đang mở.",
+    "reloadedNone": "Không có session Claude Code nào đang mở để nạp lại.",
+    "reloadedCount": "— {{count}} session",
+    "restartWarning": "Giữ tab này mở. Nếu chính AgentHub được cập nhật, dashboard sẽ khởi động lại ở bước cuối và trang tự kết nối lại.",
+    "abandoned": "Đợt cập nhật trước dừng giữa đường — rất có thể do máy khởi động lại. Hãy chạy lại.",
+    "bootstrapFailed": "Dashboard đã bị dừng nhưng không sống lại: {{error}}. Chạy /agenthub-update để khôi phục."
+  },
   "manage": {
     "installTitle": "Cài plugin",
     "installPlaceholder": "owner/repo, https://… hoặc plugin@marketplace",