Add the harness, envs, per-bot models and chat attachments

- Harness: providers, model catalog synced hourly, automatic free picks,
  cooldowns, tool loop with context trimming, MCP computer tools
- Bots queue runs replies and tasks through the harness; jobs wait
  (attempt refunded) while every model is resting
- Envs: Settings > Environment, scoped general/workspace/computer,
  written to computers and redacted from tool output
- Models: Settings > Models, per-harness provider select defaulting to
  OpenRouter, and a models modal on each bot's chat (the coordinator's
  edits the defaults)
- Chat: thinking row while a reply runs, file attachments (upload,
  paste, drop) that replies read as images, audio and document text
- Fix media uploads failing after a user's first file, and private
  files being served from the public media path

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

src/layouts/bots/index.tsx

@@ -1,5 +1,6 @@
 import React from "react";
 import Row from "@moduletrace/twui/layout/Row";
+import useWebSocket from "@moduletrace/twui/hooks/useWebSocket";
 import BotsRail from "./(sections)/bots-rail";
 
 /**
@@ -12,6 +13,11 @@ export default function BotsLayout({
 }: {
     children: React.ReactNode;
 }) {
+    /**
+     * One socket for live bot updates (see `useServerEvent`).
+     */
+    useWebSocket({ url: "/ws" });
+
     return (
         <Row className="w-full h-screen gap-0! flex-nowrap items-stretch overflow-hidden bg-paper text-ink">
             <BotsRail />