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]/models/(functions)/save-bot-harness-settings.ts

@@ -0,0 +1,19 @@
+import fetchApi from "@moduletrace/twui/utils/fetch/fetchApi";
+import type { APIResponseObject } from "@moduletrace/bunext/types";
+import type { SaveBotHarnessSettingsRequest } from "@/src/schemas/harness-schema";
+import type { BotHarnessOverviewPayload } from "@/src/types";
+
+/**
+ * Saves a worker bot's own model settings and returns the fresh page data.
+ */
+export default async function saveBotHarnessSettings(
+    body: SaveBotHarnessSettingsRequest,
+) {
+    return await fetchApi<
+        SaveBotHarnessSettingsRequest,
+        APIResponseObject<BotHarnessOverviewPayload>
+    >(`/api/admin/bots/save-harness-settings`, {
+        method: "POST",
+        body,
+    });
+}

src/pages/admin/bots/[bot_id]/models/(sections)/bot-models-section.tsx

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+import { useContext } from "react";
+import { AppContext } from "@/src/pages/__root";
+import SettingsShell from "@/src/pages/admin/settings/(partials)/settings-shell";
+import BotHarnessForm from "../../(partials)/bot-harness-form";
+
+/**
+ * A worker bot's models: per harness, the default or its own pick. The
+ * same form as the chat header's models modal.
+ */
+export default function BotModelsSection() {
+    const { pageProps } = useContext(AppContext);
+    const bot = pageProps?.bot;
+    const overview = pageProps?.bot_harness_overview;
+
+    if (!bot?.id || !overview) return null;
+
+    return (
+        <SettingsShell
+            title={`${bot.name}'s models`}
+            description="Uses the default models unless you pick its own."
+        >
+            <BotHarnessForm bot={bot} harnesses={overview.harnesses} />
+        </SettingsShell>
+    );
+}

src/pages/admin/bots/[bot_id]/models/index.server.ts

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+import userAuth from "@/src/functions/backend/auth/user-auth";
+import grabBots from "@/src/functions/backend/db/bots/grab-bots";
+import grabBotHarnessOverview from "@/src/functions/backend/db/harness/grab-bot-harness-overview";
+import type { PagePropsType, PageQueryObject } from "@/src/types";
+import type { BunextPageServerFn } from "@moduletrace/bunext/types";
+
+/**
+ * A worker bot's model settings. The coordinator always uses the defaults,
+ * so its page goes back to its conversation.
+ */
+export const server: BunextPageServerFn<PagePropsType> = async (params) => {
+    const query: PageQueryObject = params.query;
+    const { user } = await userAuth({ req: params.req });
+
+    if (!user?.id) {
+        return { redirect: { destination: "/auth/login" } };
+    }
+
+    const bots = await grabBots({ user_id: user.id });
+    const bot = bots.find((b) => String(b.id) === String(query.bot_id));
+
+    if (!bot?.id) {
+        return { redirect: { destination: "/admin/bots" } };
+    }
+
+    if (bot.kind == "coordinator") {
+        return { redirect: { destination: `/admin/bots/${bot.id}` } };
+    }
+
+    return {
+        props: {
+            bots,
+            bot,
+            bot_harness_overview: await grabBotHarnessOverview({ bot_id: bot.id }),
+        },
+    };
+};

src/pages/admin/bots/[bot_id]/models/index.tsx

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+import type { PagePropsType } from "@/src/types";
+import type { BunextPageModuleMetaFn } from "@moduletrace/bunext/types";
+import { SiteData } from "@/src/data/site-data";
+import BotModelsSection from "./(sections)/bot-models-section";
+
+export default function BotModelsPage() {
+    return <BotModelsSection />;
+}
+
+export const meta: BunextPageModuleMetaFn = async (params) => {
+    const bot = (params.serverRes?.props as PagePropsType | undefined)?.bot;
+
+    return {
+        title: `${bot?.name || "Bot"} models | ${SiteData["SiteName"]}`,
+        description: `Which models ${bot?.name || "this bot"} uses.`,
+    };
+};