[Feature]: Upgrade to Zod V4

[colinaaa]

What problem does this feature solve?

Zod has released a new major v4, which is faster, slimmer, more tsc-efficient, and implements some long-requested features. See Introducing Zod 4 for more details.

Key migration points include:

• Update deprecated APIs. E.g: z.record() with a single argument: https://zod.dev/v4/changelog#drops-single-argument-usage
• The result of z.function() is no longer a Zod schema: https://zod.dev/v4/changelog#zfunction
• The ZodRspackCrossChecker which introduced in fix: required amd in umd external object #8369 and fix: should validate options of builtin swc loader #10055 (for externals and options of builtin:swc-loader)
• The zod-validation-error does not support Zod v4 for now. See: Zod v4 support causaly/zod-validation-error#455

What does the proposed API of configuration look like?

No changes to public APIs are required.