Replace Watr Mainnet with Aeru (Chain ID 192)

[soosho]

Summary

This PR replaces the inactive Watr Mainnet entry with Aeru, which is the active chain using chainId 192.

Reason for Replacement

Watr Mainnet appears to be inactive based on explorer data:

• Total blocks: 133
• Average block time: 11h 29m
• Total transactions: 132
• Explorer: https://explorer.watr.org/

Aeru is an active blockchain network that uses chainId 192 and should be properly represented in Chainlist.

Changes Made

1. Updated constants/additionalChainRegistry/chainid-192.js:

   • Replaced Watr Mainnet configuration with Aeru's chain data
   • Added RPC endpoints: https://rpc.aruscan.com and wss://wss.aruscan.com
   • Added explorer: https://aruscan.com
   • Included IPFS icon

2. Updated constants/chainIds.js:

   • Added mapping "192": "aru" for icon lookup (maintains numerical ordering)

Chain Information

• Name: Aeru
• Chain: ARU
• Chain ID: 192
• Network ID: 192
• Native Currency: ARU (18 decimals)
• RPC Endpoints:
  • https://rpc.aruscan.com
  • wss://wss.aruscan.com
• Explorer: https://aruscan.com
• Info URL: https://atheru.org/
• Features: EIP155

Verification

• Chain ID is correct (192)
• RPC endpoints are accessible
• Explorer URL is valid
• Icon is properly formatted (IPFS)
• All required fields are present
• Numerical ordering maintained in chainIds.js