Revert "feat: add file routing option"

This reverts commit 750783e860.

tsup.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from 'tsup'
+
+export default defineConfig({
+  entry: ['src/index.ts', 'src/client/index.ts'],
+  format: ['cjs', 'esm'],
+  splitting: false,
+  clean: true,
+  external: ['#app', '#imports'],
+  dts: true,
+  outExtension({ format }) {
+    return {
+      js: format === 'esm' ? '.mjs' : `.${format}`,
+    }
+  },
+})