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/websocket/(functions)/send-to-user.ts

@@ -0,0 +1,28 @@
+import type { WebSocketDataType } from "@/src/types";
+import { getAllRooms } from "../(data)/rooms";
+
+type Params = {
+    user_id: number | string;
+    data: WebSocketDataType;
+};
+
+/**
+ * Sends to every open socket of one user. Every socket joins `public` on
+ * open, so its members are all connected clients.
+ */
+export function sendToUser({ user_id, data }: Params) {
+    const members = getAllRooms().get("public");
+
+    if (!members) return;
+
+    const message = JSON.stringify(data);
+
+    for (const ws of members) {
+        if (
+            String(ws.data.user?.id) == String(user_id) &&
+            ws.readyState === WebSocket.OPEN
+        ) {
+            ws.send(message);
+        }
+    }
+}