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

server/__tests__/ai-tools.test.js

@@ -195,7 +195,7 @@ describe("enable / default", () => {
       prompt: { mode: "flag" },
       resume: false,
       bypass: false,
-      routerCapable: false,
+      proxyCapable: false,
       modelFlag: false,
       defaultModel: null,
       modelVendor: null,
@@ -203,7 +203,7 @@ describe("enable / default", () => {
       install: null,
       update: null,
     });
-    assert.equal(v.tools.find((t) => t.id === "codex").routerCapable, true);
+    assert.equal(v.tools.find((t) => t.id === "codex").proxyCapable, true);
   });
 });