feat: improve build config (#2115)

apps/web/preset.config.mjs

@@ -1,6 +1,23 @@
+// @ts-check
 import 'dotenv/config';
 
-const config = {
+/**
+ * @type {import('@affine/env').BlockSuiteFeatureFlags}
+ */
+export const blockSuiteFeatureFlags = {
+  enable_database: true,
+  enable_slash_menu: true,
+  enable_edgeless_toolbar: true,
+  enable_block_hub: true,
+  enable_drag_handle: true,
+  enable_surface: true,
+  enable_linked_page: true,
+};
+
+/**
+ * @type {import('@affine/env').BuildFlags}
+ */
+export const buildFlags = {
   enableLegacyCloud: process.env.ENABLE_LEGACY_PROVIDER
     ? process.env.ENABLE_LEGACY_PROVIDER === 'true'
     : true,
@@ -11,4 +28,3 @@ const config = {
     process.env.ENABLE_DEBUG_PAGE ?? process.env.NODE_ENV === 'development'
   ),
 };
-export default config;