fix: `export type { VikeConfig }` #15275

Job	Run time
prepare	4s
Vitest (unit tests) - Ubuntu - Node.js 18	39s
Vitest (E2E tests) - Ubuntu - Node.js 18	42s
Vitest (E2E tests) - Win - Node.js 18	1m 35s
TypeScript - Ubuntu - Node.js 18	1m 38s
Boilerplates - Ubuntu - Node.js 18	1m 36s
Examples React - Ubuntu - Node.js 22	2m 45s
Examples React - Win - Node.js 18	4m 59s
Examples Vue/Others - Ubuntu - Node.js 22	1m 50s
Examples Vue/Others - Win - Node.js 18	2m 54s
Examples Misc - Ubuntu - Node.js 18	1m 26s
Examples Misc - Win - Node.js 18	2m 40s
Unit Tests E2E - Ubuntu - Node.js 22	3m 3s
Unit Tests E2E - Win - Node.js 18	4m 46s
Cloudflare - Ubuntu - Node.js 22	57s
https://vike.dev - Ubuntu - Node.js 22	1m 5s
	32m 39s

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