docs: add more before/after examples for Korean model output

[devswha]

Goal

Add 3-5 more Korean before/after examples to docs/EXAMPLES.md.

Why

Korean is one of patina's strongest supported languages, but contributors need concrete examples of what a good pattern-backed rewrite looks like.

Suggested scope

• Add examples from different registers: blog, product copy, technical explanation, and email.
• For each example, include Before, After, and Patterns removed.
• Keep claims stable; do not add new facts in the rewrite.

Acceptance criteria

• docs/EXAMPLES.md has at least 3 new Korean examples.
• Each example names the pattern family it demonstrates.
• npm test still passes.