Add workspaces, conversation sessions, app-managed computers and pictures

- Rail: Add icon with stacked form modals (bot, workspace, computer),
  coordinator, recent bots with "See all bots", Workspaces section, and
  a workspace mode listing only its crew
- Workspaces: page for context, bots (per-workspace instructions and
  memory), computers (default, link, unlink), models and delete;
  conversations scoped per bot per workspace
- Sessions: conversations split into searchable, reopenable sessions
  with carry-over summaries; sessions and new-session header icons
- Computers: created and provisioned over the docker socket, home dir
  kept at DATA_DIR/computers/<id> after delete; super admins only
- Models: workspace settings win over a bot's own, then the defaults
- Pictures for bots and workspaces; bots editable from the header
- Coordinator tools: update_workspace, set_bot_workspace_instructions

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

src/pages/admin/workspaces/index.tsx

@@ -0,0 +1,14 @@
+import type { BunextPageModuleMeta } from "@moduletrace/bunext/types";
+import { SiteData } from "@/src/data/site-data";
+
+/**
+ * Never rendered: `index.server.ts` always redirects.
+ */
+export default function WorkspacesPage() {
+    return null;
+}
+
+export const meta: BunextPageModuleMeta = {
+    title: `Workspaces | ${SiteData["SiteName"]}`,
+    description: `Your workspaces.`,
+};