fix: add missing Devnet and Regtest for PlatformPayment

[xdustinface]

Summary by CodeRabbit

• New Features
  • Extended platform payment support to include Devnet and Regtest networks.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The AccountType::PlatformPayment derivation path was modified to handle three network variants—Testnet, Devnet, and Regtest—using the same platform payment root path, consolidating previously separate network-specific branches into a unified match arm.

Changes

Cohort / File(s)	Summary
Network matching consolidation key-wallet/src/account/account_type.rs	Expanded the network match arm for PlatformPayment derivation path from handling Network::Testnet alone to Network::Testnet | Network::Devnet | Network::Regtest, all routing to the same testnet platform payment root path

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Three networks now share a single road,
Testnet, Devnet, Regtest aligned,
The wallet hops with lighter load,
Where paths once scattered, now entwined! 🪙

🚥 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 title accurately describes the main change: adding support for Devnet and Regtest network variants to the PlatformPayment derivation path in AccountType.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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