Add CLI server and move UI to HTTP API

packages/cli/src/server/routes/filesystem.ts

@@ -0,0 +1,25 @@
+import { FastifyInstance } from "fastify"
+import { z } from "zod"
+import { FileSystemBrowser } from "../../filesystem/browser"
+
+interface RouteDeps {
+  fileSystemBrowser: FileSystemBrowser
+}
+
+const FilesystemQuerySchema = z.object({
+  path: z.string().optional(),
+})
+
+export function registerFilesystemRoutes(app: FastifyInstance, deps: RouteDeps) {
+  app.get("/api/filesystem", async (request, reply) => {
+    const query = FilesystemQuerySchema.parse(request.query ?? {})
+    const targetPath = query.path ?? "."
+
+    try {
+      return deps.fileSystemBrowser.list(targetPath)
+    } catch (error) {
+      reply.code(400)
+      return { error: (error as Error).message }
+    }
+  })
+}