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/pages/admin/bots/[bot_id]/(partials)/bot-thinking-row.tsx

@@ -0,0 +1,34 @@
+import Row from "@moduletrace/twui/layout/Row";
+import Span from "@moduletrace/twui/layout/Span";
+import BotStone from "@/src/components/general/bot-stone";
+import type { BotHue } from "@/src/dict/bot-dict";
+import { BotReplyJobTitle, BotWaitingStatusLine } from "@/src/dict/bot-queue-dict";
+import type { BotWithLastMessage } from "@/src/types";
+
+type Props = {
+    bot: BotWithLastMessage;
+};
+
+/**
+ * Under the last message while the bot is working on a reply (or waiting
+ * for a model to come back), so a slow reply doesn't look like none.
+ */
+export default function BotThinkingRow({ bot }: Props) {
+    const thinking = bot.face == "working" && bot.status_line == BotReplyJobTitle;
+    const waiting = bot.face == "asleep" && bot.status_line == BotWaitingStatusLine;
+
+    if (!thinking && !waiting) return null;
+
+    return (
+        <Row role="status" className="w-full gap-3! flex-nowrap items-center">
+            <BotStone
+                hue={(bot.hue || null) as BotHue | null}
+                face={thinking ? "working" : "asleep"}
+                size={28}
+            />
+            <Span className="text-sm leading-5 text-ink-secondary animate-pulse motion-reduce:animate-none">
+                {thinking ? `${bot.name || "The bot"} is thinking…` : `${BotWaitingStatusLine}…`}
+            </Span>
+        </Row>
+    );
+}