feat: add interactive web terminal for bot containers (#232)

* feat(terminal): add interactive web terminal for bot containers

Add WebSocket-based terminal endpoint (/container/terminal/ws) that
provides a full PTY shell session inside the bot's MCP container.
Extend the gRPC proto with pty and resize fields, implement PTY exec
on the container side using creack/pty, and add an xterm.js-based
terminal component in the frontend bot detail page.

* chore: add /mcp in .gitignore

* feat(terminal): add multi-tab support, localStorage cache, and reactivity fixes

- Support unlimited terminal tabs with add/close/switch
- Cache terminal content to localStorage via SerializeAddon for session persistence
- Use shallowReactive for tab objects to ensure status updates trigger UI reactivity
- Fix listener leak by tracking and disposing onData/onResize on reconnect
- Fix bottom clipping by using inset offsets instead of padding

apps/web/package.json

@@ -22,6 +22,9 @@
     "@tanstack/vue-table": "^8.21.3",
     "@vee-validate/zod": "^4.15.1",
     "@vueuse/core": "^14.1.0",
+    "@xterm/addon-fit": "^0.11.0",
+    "@xterm/addon-serialize": "^0.14.0",
+    "@xterm/xterm": "^6.0.0",
     "dotenv": "^17.2.3",
     "echarts": "^6.0.0",
     "katex": "^0.16.28",