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

docs/DATABASE.md

@@ -398,7 +398,7 @@ CREATE TABLE notifications (
 
 Per-model pricing rules for cost calculation, keyed by `model_pattern` (a SQL-style glob; `%` matches any characters). Rates are per **million** tokens (USD). The longest matching pattern wins.
 
-**Automatic rates.** `server/lib/pricing-sync.js` runs at server start and every 15 minutes, and fetches LiteLLM's public price list (`model_prices_and_context_window.json` on GitHub) at most once a day. Each pass (1) INSERTS a row, `source = 'sync'`, for every Claude, OpenAI or Gemini model seen in `token_usage` whose family (the id minus a `-YYYYMMDD` / `-YYYY-MM-DD` suffix; OpenAI means `gpt-…`, `o<n>…` or `codex-…`; Gemini means `gemini-…`, taken whole) has no `<family>%` row of its own, AND for every **current** model of the three vendors before anyone uses it — a list key that is a family itself, `mode` `chat`/`responses`, not past its `deprecation_date`, not an audio/search/TTS/realtime/image/embedding variant, and of the current generation (any `claude-<name>-…`; `gpt-` 5 and up; `gemini-` 3 and up — `MIN_GEN`); (2) UPDATES the rates of its own `sync` rows when the list changes; (3) adopts a row from before the `source` column (`NULL`: a seed, an old sync insert or an old edit) as `sync` only while its rates still equal the list exactly. A row edited through `PUT /api/pricing` becomes `source = 'user'` and is never touched again; a deleted row's pattern goes to `model_pricing_dismissed` and is never added back. An entry is taken only from its own vendor (`litellm_provider` `anthropic` / `openai`, and `vertex_ai-language-models` or `gemini` for Gemini); an OpenAI or Gemini row carries no cache-write charge unless the list names one, and no fast rate. Gemini's >200k-token rate is not modelled (the base rate is used). A router's model id (`clinepass/…`) is never priced automatically. `POST /api/settings/reset-pricing` empties `model_pricing_dismissed` for its scope and runs a sync right after reseeding (waiting up to 3 s), so the OpenAI and Gemini rows a reset wiped come straight back; with `{scope: "claude"}` (the Claude Code tab's **Reset Defaults**) it deletes and reseeds only `claude-…` rows, so other vendors' rows and a custom router row survive. A rate outside 0–1000 $/MTok is rejected, and a failed fetch changes nothing. Set `AGENTHUB_PRICING_SYNC=0` (or `false`/`off`) to turn it off.
+**Automatic rates.** `server/lib/pricing-sync.js` runs at server start and every 15 minutes, and fetches LiteLLM's public price list (`model_prices_and_context_window.json` on GitHub) at most once a day. Each pass (1) INSERTS a row, `source = 'sync'`, for every Claude, OpenAI or Gemini model seen in `token_usage` whose family (the id minus a `-YYYYMMDD` / `-YYYY-MM-DD` suffix; OpenAI means `gpt-…`, `o<n>…` or `codex-…`; Gemini means `gemini-…`, taken whole) has no `<family>%` row of its own, AND for every **current** model of the three vendors before anyone uses it — a list key that is a family itself, `mode` `chat`/`responses`, not past its `deprecation_date`, not an audio/search/TTS/realtime/image/embedding variant, and of the current generation (any `claude-<name>-…`; `gpt-` 5 and up; `gemini-` 3 and up — `MIN_GEN`); (2) UPDATES the rates of its own `sync` rows when the list changes; (3) adopts a row from before the `source` column (`NULL`: a seed, an old sync insert or an old edit) as `sync` only while its rates still equal the list exactly. A row edited through `PUT /api/pricing` becomes `source = 'user'` and is never touched again; a deleted row's pattern goes to `model_pricing_dismissed` and is never added back. An entry is taken only from its own vendor (`litellm_provider` `anthropic` / `openai`, and `vertex_ai-language-models` or `gemini` for Gemini); an OpenAI or Gemini row carries no cache-write charge unless the list names one, and no fast rate. Gemini's >200k-token rate is not modelled (the base rate is used). A proxy's model id (`clinepass/…`) is never priced automatically. `POST /api/settings/reset-pricing` empties `model_pricing_dismissed` for its scope and runs a sync right after reseeding (waiting up to 3 s), so the OpenAI and Gemini rows a reset wiped come straight back; with `{scope: "claude"}` (the Claude Code tab's **Reset Defaults**) it deletes and reseeds only `claude-…` rows, so other vendors' rows and a custom proxy row survive. A rate outside 0–1000 $/MTok is rejected, and a failed fetch changes nothing. Set `AGENTHUB_PRICING_SYNC=0` (or `false`/`off`) to turn it off.
 
 ```sql
 CREATE TABLE model_pricing (