chore(tsdown): add fixedExtension option to configuration

Author: honghuangdc

packages/create-soybean/template-vue-tsdown/tsdown.config.ts

@@ -12,5 +12,6 @@ export default defineConfig({
   clean: true,
   external: ['vue'],
   sourcemap: false,
-  minify: false
+  minify: false,
+  fixedExtension: true
 });

packages/create-soybean/tsdown.config.ts

@@ -5,5 +5,6 @@ export default defineConfig({
   platform: 'node',
   clean: true,
   sourcemap: false,
-  minify: false
+  minify: false,
+  fixedExtension: true
 });

tsdown.config.ts

@@ -6,5 +6,6 @@ export default defineConfig({
   clean: true,
   dts: true,
   sourcemap: false,
-  minify: false
+  minify: false,
+  fixedExtension: true
 });