13. Replace the global collateral ratio with a per-asset risk registry

[Cedarich]

Area: Soroban
Complexity: Medium

Summary:
Support more realistic market configuration by storing risk rules per asset instead of relying on one global threshold.

Acceptance Criteria:

• Per-asset risk parameters are stored and readable.
• Borrow checks use the per-asset configuration.
• Tests cover multiple asset configurations.

[Ayinkx]

Hi i would like to work on this issue please assign to me
I can do it perfectly

[Ayinkx01]

Hi l would like to take this job

[grantfox-oss]

🦊 GrantFox — @Ayinkx1 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #184)
2. Your PR will be reviewed by the Zyntarivoid maintainers

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