Implement dynamic reserves, modular pool traits, oracle client, and batched health reads

[Davidemulo]

Summary

• add a dynamic reserve factor curve with configurable base, slope, kink, jump slope, and governance min/max bounds
• add reserve factor preview output with utilization and revenue delta versus the static factor
• introduce trait-based pool component facades and default interest/liquidation adapters
• extract a versioned shared oracle-client workspace crate with fallback/cache interfaces and wire validation into oracle reads
• add batched health-factor reads that load asset configs, asset list, and user positions once, with a public batch preview

Validation

• git diff --check
• cargo check could not be run because cargo is not installed in this environment

Closes #551
Closes #552
Closes #554
Closes #556

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