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/layouts/bots/(partials)/rail-see-all-stone.tsx

@@ -0,0 +1,21 @@
+import BotAvatar from "@/src/components/general/bot-avatar";
+import type { BotFace, BotHue } from "@/src/dict/bot-dict";
+import type { BotWithLastMessage } from "@/src/types";
+
+type Props = {
+    bot: BotWithLastMessage;
+};
+
+/**
+ * One small stone beside "See all bots".
+ */
+export default function RailSeeAllStone({ bot }: Props) {
+    return (
+        <BotAvatar
+            image_media_id={bot.image_media_id}
+            hue={(bot.hue || null) as BotHue | null}
+            face={(bot.face || "idle") as BotFace}
+            size={18}
+        />
+    );
+}