fix: pass file source path to generator for proper $ref resolution

.changeset/fix-generator-ref-resolution.md

@@ -0,0 +1,5 @@
+---
+"@asyncapi/cli": patch
+---
+
+Fix generator failing to resolve external $ref files in same directory by passing the file source path instead of the Specification object

src/domains/services/generator.service.ts

@@ -109,7 +109,7 @@ export class GeneratorService extends BaseService {
     try {
       await generator.generateFromString(asyncapi.text(), {
         ...genOption,
-        path: asyncapi,
+        path: asyncapi.getSource(),
       });
     } catch (err: unknown) {
       s.stop('Generation failed');