feat: add fallback for restricted ondo token list

[limitofzero]

Summary

Adds hardcoded fallback for Ondo tokenized list when CMS fetch fails

To Test

1. Test fallback behavior
   • Simulate CMS failure (block cms request)
   • Verify that the Ondo token list is returned as fallback - restricted list should require the consent

Summary by CodeRabbit

• Bug Fixes
  • Improved error handling for token list retrieval to gracefully fall back to a default Ondo token list instead of returning null on fetch failures, ensuring better resilience.

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[coderabbitai]

Walkthrough

This change introduces Ondo token list configuration constants and updates error handling in the restricted token list fetcher to return a default Ondo token list as fallback instead of null on fetch failures.

Changes

Cohort / File(s)	Summary
Ondo Token Constants libs/core/src/cms/consts.ts	Added ONDO_TOKEN_LIST_URL constant pointing to Ondo token list JSON and ONDO_RESTRICTED_COUNTRIES array of country codes with literal type enforcement.
Token List Fetch Error Handling libs/core/src/cms/utils/getRestrictedTokenLists.ts	Updated error handling to return a default Ondo token list (with name, URL, and restricted countries) instead of null on fetch failure.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Feat: add Ondo tokens list #6115: Adds Ondo token list source entry to tokensList.json using the same ONDO_TOKEN_LIST_URL constant introduced in this PR.
• feat: add ondo token list to bnb #6398: Adds Ondo token list entry to tokensList.json, complementing the Ondo token list URL and fallback mechanism defined here.
• feat: handle weekend for ondo tokens #6183: Modifies Ondo token list handling by consuming the ONDO_TOKEN_LIST_URL and related Ondo-specific configuration introduced in this change.

Suggested reviewers

• elena-zh
• shoom3301

Poem

🐰 Constants hop into place with care,
Ondo tokens listed here and there,
When fetch calls stumble, don't despair—
A fallback waits with country-aware flair!

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a fallback mechanism for the restricted Ondo token list.
Description check	✅ Passed	The description covers the summary and testing steps, though it omits the optional Background section. Core content is present and appropriate.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/fallback-for-rwa

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