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/functions/backend/db/bots/grab-bot-messages.ts

@@ -1,5 +1,8 @@
 import type { BUN_SQLITE_COBBLE_BOT_MESSAGES } from "@/db/types/db";
+import type { BotMessageWithAttachments } from "@/src/types";
 import BunSQLite from "@moduletrace/bun-sqlite";
+import grabMessagesMedia from "./grab-messages-media";
+import mediaToAttachment from "./media-to-attachment";
 
 type Params = {
     bot_id: number | string;
@@ -7,12 +10,13 @@ type Params = {
 };
 
 /**
- * The latest messages of a bot's conversation, oldest first.
+ * The latest messages of a bot's conversation, oldest first, with their
+ * attachments.
  */
 export default async function grabBotMessages({
     bot_id,
     limit = 100,
-}: Params): Promise<BUN_SQLITE_COBBLE_BOT_MESSAGES[]> {
+}: Params): Promise<BotMessageWithAttachments[]> {
     let sql = ``;
 
     sql += `SELECT * FROM (\n`;
@@ -27,5 +31,16 @@ export default async function grabBotMessages({
         values: [bot_id, limit],
     });
 
-    return res.payload || [];
+    const messages = res.payload || [];
+    const media = await grabMessagesMedia({
+        message_ids: messages.map((message) => Number(message.id)),
+    });
+
+    return messages.map((message) => {
+        const files = media.get(Number(message.id));
+
+        return files
+            ? { ...message, attachments: files.map((file) => mediaToAttachment({ media: file })) }
+            : message;
+    });
 }