fix: await Cypress after-run cleanup

[NgoQuocViet2001]

Summary

• await the base-path server cleanup inside the Cypress after:run lifecycle callback
• keep the shared task handler's null result unchanged

Problem

stopBasePathServer() intentionally resolves to null because Cypress task handlers must return a defined value. Passing that promise through directly makes the after:run callback return Promise<null>, but Cypress types accept only void | Promise<void>. The root typecheck therefore reports TS2769 at cypress.config.ts.

Awaiting the helper inside an async callback preserves the task contract while making the lifecycle callback resolve to void.

Validation

• pnpm exec tsc --ignoreConfig --noEmit --skipLibCheck --moduleResolution bundler --module esnext --target esnext --types node,cypress --esModuleInterop cypress.config.ts cypress/basePathServer.ts
• pnpm exec eslint cypress.config.ts
• git diff --check
• pnpm typecheck no longer reports the Cypress overload error; the remaining four errors are the existing VitePress declaration and duplicate markdown-exit dependency errors on main

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commit: 62a3671