feat(mini-apps): serve apps from ~/.rowboat/apps via app://miniapp

Apps are now user data on disk, not bundled in the repo.

- MiniAppManifest schema + mini-apps:list/get-data/seed IPC channels
- main: mini-apps-handler (list/get-data + seed install primitive) and an
  app://miniapp/<id>/ protocol host serving ~/.rowboat/apps/<id>/dist
- renderer lists installed apps from disk and loads each via app://miniapp
  (real origin: remote images/fetch work); data sourced from data.json
- removed the bundled sample apps from source (they live in ~/.rowboat/apps)

apps/x/packages/shared/src/ipc.ts

@@ -16,6 +16,7 @@ import {
 import { UserMessageContent } from './message.js';
 import { RowboatApiConfig } from './rowboat-account.js';
 import { ZListToolkitsResponse } from './composio.js';
+import { MiniAppManifest } from './mini-app.js';
 import { BrowserStateSchema } from './browser-control.js';
 import { BillingInfoSchema } from './billing.js';
 import { EmailBlockSchema, GmailThreadSchema } from './blocks.js';
@@ -1007,6 +1008,31 @@ const ipcSchemas = {
       shouldShow: z.boolean(),
     }),
   },
+  // Mini Apps: seed built-in apps to ~/.rowboat/apps/<id>/ (idempotent).
+  'mini-apps:seed': {
+    req: z.object({
+      apps: z.array(z.object({
+        manifest: MiniAppManifest,
+        html: z.string(),
+        data: z.unknown().optional(),
+      })),
+    }),
+    res: z.object({
+      seeded: z.array(z.string()),
+    }),
+  },
+  // Mini Apps: list installed app manifests from ~/.rowboat/apps/.
+  'mini-apps:list': {
+    req: z.null(),
+    res: z.object({
+      manifests: z.array(MiniAppManifest),
+    }),
+  },
+  // Mini Apps: read an app's latest data.json (agent output).
+  'mini-apps:get-data': {
+    req: z.object({ id: z.string() }),
+    res: z.object({ data: z.unknown().nullable() }),
+  },
   'composio:didConnect': {
     req: z.object({
       toolkitSlug: z.string(),