feat: v2.5.5 — AI Router renamed AI Proxy, reload onto new builds, update no longer spins

AI Proxy (was AI Router):
- server/lib/ai-proxies.js, proxy-apply.js, routes/ai-proxies.js mounted at
  /api/ai-proxies and the old /api/ai-routers; `router` still accepted on the
  start routes; profiles move to <CLAUDE_HOME>/agenthub-proxies/
- dashboard_runs.router renamed in place to proxy: an older build on the same
  DB fails on that column, so dev and prod sharing one DB update together
- a proxy's baseUrl stored as its root (a typed /v1 made /v1/v1/messages);
  Test probes Claude /v1/messages and Codex /v1/responses
- Settings → AI Proxy (/settings/ai-router redirects), ProxyPicker

Updates:
- every tab reloads onto the new UI build when its WebSocket reconnects to a
  server of another version (lib/newBuildReload.ts, once per version)
- Update now stops waiting on a plugin chain that failed or pulled nothing
  (the old server never goes down), and reloads as soon as a new version answers

Also:
- a pane whose command exits at once says so (EPANEEXITED) instead of
  "Command failed: tmux set-option … mouse on"
- the pane drag preview draws where the pane actually lands

client/src/lib/settingsSearch.ts

@@ -259,7 +259,7 @@ export const SETTINGS_INDEX: {
   { section: "agents/codex", titleKey: "codexConfig:tabs.plugins", to: "?tab=plugins" },
   { section: "agents/antigravity", titleKey: "antigravityHooks.title", keywords: ["agy", "hooks"] },
   { section: "agents/*", titleKey: "toolTab.defaultModel", keywords: ["model", "config"] },
-  { section: "ai-router", titleKey: "aiRouter.title", keywords: ["proxy", "endpoint", "key"] },
+  { section: "ai-proxy", titleKey: "aiProxy.title", keywords: ["router", "endpoint", "key"] },
   { section: "pricing", titleKey: "pricing.title", keywords: ["cost", "price", "tokens"] },
   { section: "git-credentials", titleKey: "gitCreds.title", keywords: ["login", "token"] },
   { section: "worktrees", titleKey: "worktrees.showUntracked", keywords: ["hide", "suggestions"] },