Add workspaces, computers, bot memory and the bots queue

- Schema: workspaces (+ workspace_bots, workspace_computers), containers,
  computers, bot_computers, bots.memory, workspaces.system_prompt, and
  bots_queue as a bun-sqlite isQueue table
- Main computer (and its container record) ensured with the coordinator on
  signup, seed and /admin/bots; the coordinator's access to it is locked
- Effective computer access: direct grants plus workspace computers
- Full bot prompt: core instructions, workspace prompts, then memory;
  bots can rewrite their memory and system prompt
- Queue helpers on the native BunSQLite.queue API, plus a handler that
  heartbeats, serializes per computer, recovers after restarts, reports
  lost jobs, supports cancelling and pushes outcomes over the WebSocket
- Enable SQLite foreign keys at startup so schema cascades fire
- Prune finished jobs daily

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/types/index.ts

@@ -218,6 +218,15 @@ export const WebSocketEvents = [
      * @description Events sent from Server to Client
      */
     "server:pong",
+    /**
+     * A new message in one of the user's bot conversations (`data`: the
+     * `bot_messages` row)
+     */
+    "server:bot-message",
+    /**
+     * A bot's face or status line changed (`data`: `{ id, face, status_line }`)
+     */
+    "server:bot-updated",
 ] as const;
 
 export type WebSocketDataType = {