Replace Subscan/Polkadot.js explorers with peaqscan for peaq (3338) and Agung (9990)

[cr-eative-dev]

Summary

Switch peaq mainnet and Agung testnet explorer metadata to official peaqscan

Changes

• _data/chains/eip155-3338.json
  • explorers: Subscan → peaqscan (peaqscan.xyz)
• _data/chains/eip155-9990.json
  • explorers: remove Polkadot.js and Subscan; add peaqscan (testnet.peaqscan.xyz)

Rationale

• Consolidate on the official peaqscan explorers.
• Remove outdated/less relevant explorers to avoid confusion.

Impact

• No breaking changes; only explorer metadata updated.
• Schema unchanged ("standard": "none").

Links

• Mainnet explorer: peaqscan.xyz
• Testnet explorer: testnet.peaqscan.xyz

[github-actions]

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