feat: model lists and prices that follow each AI tool, a Settings tab per tool, live lane status (#40)

Pricing: the LiteLLM sync now adds every current Claude / GPT (>= 5) /
Gemini (>= 3) chat model before it is used and keeps its own rows
(model_pricing.source = 'sync', the Auto badge) at the published rate. A
user's row (any PUT) and a deleted pattern (model_pricing_dismissed) are
never touched; a deleted built-in row is not re-seeded at the next start; a
reset re-applies the list at once; retired Claude models are priced only
once used.

Models: GET /api/ai-tools/:id/models reads each tool's own list (Codex's
models_cache.json, Claude's aliases named after the newest version plus
priced versions, a catalog tool's vendor rows plus the models its sessions
used). A catalog `model: {flag, vendor?}` field passes `<flag> <id>`
(validated: never a flag or shell text); a per-tool default model starts
each run, and a resume keeps the session's own model.

Settings: every installed, enabled catalog tool without its own tab gets
one (AiToolConfig.tsx): path, homepage, Update, sessions/cost/lanes,
default model, vendor pricing, and the config files its release catalog
lists, edited over the opened sha, syntax-checked, backed up, written
atomically; credential-looking names refused. Antigravity keeps its hooks
card there.

Lanes: a just-started run no longer reads "dead" (age counts the run's
start while the old session is still bound); a second dashboard on the
same database re-broadcasts the lanes the other changed (PRAGMA
data_version, every 2 s); a lane start with a bad model answers 400.

DB: every migration runs under a cross-process lock (<db>-migrate.lock), so
two dashboards started at once on a fresh database both come up.

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

@@ -31,12 +31,10 @@
       "howItWorksBody": "When a session reports usage, the dashboard finds the first pricing rule whose pattern matches the model id and multiplies (input tokens / 1M) and (output tokens / 1M) by the rates below to compute cost. Rules are evaluated top-to-bottom - the first match wins.",
       "patternsTitle": "Pattern syntax",
       "patternsBody": "Patterns are SQL-style globs. % is a wildcard that matches any characters. For example: claude-opus-4-7% matches every model id that starts with claude-opus-4-7 (e.g. claude-opus-4-7, claude-opus-4-7-20260101). claude-%-haiku matches any haiku variant. An exact id like claude-sonnet-4-6 only matches itself.",
-      "manualUpdates": "You must update prices manually",
-      "manualUpdatesBody": "Anthropic publishes pricing changes on their website - there is no live feed. When a new model launches or rates change, edit the matching rule (or add a new one above the catch-all) so newly recorded sessions are costed correctly. Already-stored sessions keep the price that was applied at ingest time.",
       "apiPricing": "Reference only - API rates",
       "apiPricingBody": "These are pay-as-you-go API rates. If you use Claude Code on a subscription plan (Pro, Max, Team, or Enterprise), your actual cost is a flat monthly fee, not per-token - so these figures will usually be higher than what you really pay. Treat the costs here as a usage estimate for reference, not a bill.",
       "synced": "Prices are filled in automatically",
-      "syncedBody": "A model a session uses with no rule of its own is priced from LiteLLM's public price list the first time it is seen. That row is never updated afterwards: edit it here when the vendor's rates change. Already-stored sessions keep the price that was applied at ingest time.",
+      "syncedBody": "Every current Claude, OpenAI and Gemini model is priced from LiteLLM's public price list, checked once a day, as is any other model the moment a session uses it. Rows marked Auto follow that list when a rate changes; a row you edit becomes yours and is never touched again, and a row you delete stays deleted. Already-stored sessions keep the price that was applied at ingest time.",
       "apiPricingOtherBody": "These are pay-as-you-go API rates. If you use this CLI on a subscription plan, your actual cost is a flat fee, not per-token - so these figures will usually be higher than what you really pay. Treat them as a usage estimate, not a bill."
     },
     "cacheWrite5m": "Cache Write (5m)",
@@ -62,7 +60,9 @@
         "pattern": "gemini-3.8-flash%",
         "name": "Gemini 3.8 Flash"
       }
-    }
+    },
+    "autoBadge": "Auto",
+    "autoBadgeTitle": "Kept at the published rate automatically (LiteLLM's price list, checked daily). Edit it to keep your own rate."
   },
   "claudeHome": {
     "title": "CLAUDE_HOME",
@@ -624,5 +624,20 @@
     "unsupported": "Antigravity hooks from AgentHub need a POSIX shell, so they are not available on Windows.",
     "unreadable": "AgentHub cannot read {{path}}: {{error}}",
     "failed": "Could not change Antigravity hooks: {{message}}"
+  },
+  "toolTab": {
+    "update": "Update…",
+    "usage_one": "{{count}} session · ${{cost}}",
+    "usage_other": "{{count}} sessions · ${{cost}}",
+    "lanes": "Lanes:",
+    "defaultModel": "Default model",
+    "defaultModelHint": "The model a new run in this tool's lanes starts on. The run form can still pick another one.",
+    "saveDefaultModel": "Save default model",
+    "config": "Config files",
+    "configHint": "This tool's own settings files. A save is checked for valid syntax, the old text is backed up in AgentHub's data folder, and nothing is saved if the file changed since you opened it.",
+    "missing": "This file does not exist yet",
+    "save": "Save",
+    "close": "Close",
+    "saved": "Saved. Backup: {{backup}}"
   }
 }