fix: cleanup builder directories (#319)

* fix: add sveltekit server routes to builder

* fix: remove root workflow dir check

* fix missing root level workflow route

* Fix: The constructor now hardcodes `dirs: ['src/routes', 'src/lib']` which silently ignores any user\-provided `dirs` option passed to the plugin\, breaking the documented API and removing support for custom workflow directories\.

* Fix: The test expectations don\'t match the new implementation of `getWorkflowDirs()`\. The mock provides `scanDirs` which the new code no longer uses\, and the new implementation adds scanning of `routesDir` and `apiDir` instead\.

* fix(nitro): use src dir

---------

Co-authored-by: Vercel <vercel[bot]@users.noreply.github.com>
Co-authored-by: vercel[bot] <35613825+vercel[bot]@users.noreply.github.com>

Author: adriandlam

packages/sveltekit/src/builder.ts

@@ -228,24 +228,3 @@ export const OPTIONS = createSvelteKitHandler('OPTIONS');`,
     }
   }
 }
-
-/**
- * Gets the list of directories to scan for workflow files.
- */
-export function getWorkflowDirs(options?: { dirs?: string[] }): string[] {
-  return unique([
-    // User-provided directories take precedence
-    ...(options?.dirs ?? []),
-    // Scan routes directories (like Next.js does with app/pages directories)
-    // This allows workflows to be placed anywhere in the routes tree
-    "routes",
-    "src/routes",
-    // Also scan dedicated workflow directories for organization
-    "workflows",
-    "src/workflows",
-  ]).sort();
-}
-
-function unique<T>(array: T[]): T[] {
-  return Array.from(new Set(array));
-}