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/scripts/seed-bots.ts

@@ -17,7 +17,7 @@ import ensureCoordinatorBot from "@/src/functions/backend/db/bots/ensure-coordin
 
 /**
  * Seeds the sample crew from the approved chat design into one user's
- * workspace. The coordinator already exists (it's made with the account),
+ * crew. The coordinator already exists (it's made with the account),
  * so its sample messages go onto it. Idempotent: skips a user who already
  * has worker bots.
  *