feat: update Coingecko IDs and branding for MANTRA assets

[BigtoMantraDev]

Need to wait for https://www.coingecko.com/en/coins/mantra start feeding price.

Summary by CodeRabbit

• Chores
  • Updated cryptocurrency identifier mappings across MANTRA network configurations on mainnet and testnet.
  • Synchronized asset denomination data across network configuration files.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Cache: Disabled due to data retention organization setting

Knowledge base: Disabled due to Reviews -> Disable Knowledge Base setting

📥 Commits

Reviewing files that changed from the base of the PR and between 9e768fa and 4806a8f.

📒 Files selected for processing (13)

• chains/mainnet/0_mantra-evm.json
• chains/mainnet/0_mantra.json
• chains/mainnet/2_mantra-dukong-evm.json
• chains/mainnet/2_mantra-dukong.json
• chains/testnet/1_mantra-archive.json
• chains/testnet/3_mantra-dukong-archive.json
• chains/testnet/4_mantra-canary.json
• chains/testnet/5_mantra-canary-archive.json
• chains/testnet/6_mantra-skynet-evm.json
• chains/testnet/6_mantra-skynet.json
• chains/testnet/7_mantra-manveniam-evm.json
• chains/testnet/7_mantra-manveniam.json
• chains/testnet/8_mantra-dryrun.json

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Walkthrough

This pull request updates CoinGecko identifiers across MANTRA blockchain chain configuration files. The coingecko field is updated from "om" to "mantra" and coingecko_id from "mantra-dao" to "mantra" across mainnet and testnet chain configurations.

Changes

Cohort / File(s)	Summary
Mainnet Configurations chains/mainnet/0_mantra-evm.json, chains/mainnet/0_mantra.json, chains/mainnet/2_mantra-dukong-evm.json, chains/mainnet/2_mantra-dukong.json	Updated coingecko from om to mantra and assets[0].coingecko_id from mantra-dao to mantra.
Testnet Archive & Canary Configurations chains/testnet/1_mantra-archive.json, chains/testnet/3_mantra-dukong-archive.json, chains/testnet/4_mantra-canary.json, chains/testnet/5_mantra-canary-archive.json, chains/testnet/8_mantra-dryrun.json	Updated coingecko from om to mantra and assets[0].coingecko_id from mantra-dao to mantra.
Testnet Skynet & Manveniam Configurations chains/testnet/6_mantra-skynet-evm.json, chains/testnet/6_mantra-skynet.json, chains/testnet/7_mantra-manveniam-evm.json, chains/testnet/7_mantra-manveniam.json	Updated coingecko from om to mantra and assets[0].coingecko_id from mantra-dao to mantra. Note: 1_mantra-archive.json also updates asset base from uom to amantra and symbol from OM to MANTRA.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 From "om" to "mantra" the config files sing,
CoinGecko identifiers dance in spring,
Consistent updates across every chain,
Mainnet and testnet aligned once again,
Configuration's sweet refrain!

🚥 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 primary change: updating Coingecko IDs (from 'mantra-dao' to 'mantra') and coingecko field values across multiple MANTRA chain configuration files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/update-coingecko-id

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