Write 'HTS vs ERC: When to Use What' (evm/hedera-services/hybrid/hts-vs-erc)

**Page:** `evm/hedera-services/hybrid/hts-vs-erc.mdx`

**Context:** Siblings `erc-compatibility` and `hybrid/index` are written.

**Scope:** Decision matrix — native HTS vs ERC-20/721 contract vs hybrid. Trade-offs table (markdown) and a recommendation per use case.

### Acceptance criteria
- [ ] Replace the placeholder template with real content
- [ ] Remove `hidden: true` from the frontmatter
- [ ] Follow the style guide: **markdown tables only** (no HTML ``), and avoid AI-tell phrasing (no em-dashes, "delve", "leverage", "not just X but Y")
- [ ] Add working cross-links to related pages
- [ ] Confirm any code samples run on testnet