docs: remove Bitcoin Testnet 4 from supported networks

[fadeev]

Summary by CodeRabbit

• Documentation
  • Removed three Bitcoin Testnet faucet entries (mempool.space, testnet4.dev, triangleplatform.com) from reference documentation in both English and Chinese language versions.

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Project	Deployment	Review	Updated (UTC)
docs-v2	Ready	Preview	Jan 19, 2026 0:23am

[coderabbitai]

📝 Walkthrough

Walkthrough

Removed three Bitcoin testnet faucet entries (mempool.space, testnet4.dev, triangleplatform.com) from the faucet reference documentation across English and Chinese language versions. No structural or logical changes.

Changes

Cohort / File(s)	Summary
Faucet Reference Documentation src/pages/reference/faucet.en-US.mdx, src/pages/reference/faucet.zh-CN.mdx	Removed three testnet faucet service entries from reference tables in both language versions (−3 rows per file).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title accurately reflects the primary change: removing Bitcoin Testnet 4 faucet entries from documentation files in both English and Chinese versions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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