feat(ai-tools): catalog of AI coding CLIs, detection, enable/default, lanes for any tool (#40 A1)

server/lib/ai-tools.js loads server/data/ai-tools/*.json (38 tools, data from
Orca, MIT) plus DASHBOARD_AI_TOOLS_DIR, detects each CLI by walking PATH, and
keeps enable/default in <data dir>/ai-tools.json. shell-path.js merges the
login shell's PATH at startup and on Refresh. /api/ai-tools lists, refreshes
and toggles; /api/run/binary resolves through the catalog.

Lanes accept any catalog id (EDISABLED for a disabled one on creation, ENOTOOL
at start once a tool left the catalog). pty-run keeps the Claude/Codex
builders and builds every other tool's argv from its catalog file, pasting an
after-start prompt through a tmux buffer; every pane gets the hydrated PATH.
A per-run bypass switch appends the catalog's bypass args (Codex included).
POST /api/run now forwards sandbox/approval/resumeLast, which it dropped.
agenthub lanes add gains --tool.

server/data/ai-tools/codebuff.json

@@ -0,0 +1,13 @@
+{
+  "id": "codebuff",
+  "label": "Codebuff",
+  "detect": [
+    "codebuff"
+  ],
+  "prompt": {
+    "mode": "after-start",
+    "delayMs": 3000
+  },
+  "homepageUrl": "https://www.codebuff.com/docs/help/quick-start",
+  "faviconDomain": "codebuff.com"
+}