feat(config): track transitive config dependencies for watch reload

[sxzz]

• This PR contains AI-generated code, but I have carefully reviewed it myself. Otherwise, my PR may be closed.

Description

Replace configFiles: string[] with configDeps: Set<string> and track transitive imports of tsdown.config.ts (and optional Vite config) via import-without-cache's AsyncLocalStorage depsStore and unrun's dependencies output.

Watch mode now triggers a full restart when any imported helper of the config changes, not just the config file itself. Set.has() also replaces Array.includes() for the reload check.

ResolvedConfig.configDeps is exposed as part of the public resolved config shape for downstream consumers.

Linked Issues

Additional context

• Bumps `import-without-cache` catalog to `^0.3.3` (exposes `depsStore` AsyncLocalStorage).
• On Node versions without `module.registerHooks` (`!isSupported`) using the `native` loader, transitive deps cannot be tracked; behavior falls back to the pre-refactor root-config-only reload. The `auto` loader already picks `unrun` on those Node versions, which still reports deps.
• Within a workspace, multiple sub-configs share the same `configDeps` Set reference by design so that Vite-loaded deps propagate to siblings.

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commit: 16bbb6a