Align `defi` Module — Protocol Adapter Registry & Strategy Discovery

[grantfox-oss]

Description
The AaveAdapter implements the ProtocolAdapter interface, but there is no registry or factory for protocol adapters. Adding a new protocol (Compound, Uniswap, etc.) requires manual wiring with no discovery mechanism. The DeFiModule doesn't register the adapter as a provider, so it can't be injected into services. This blocks all future DeFi protocol integrations.

Direction

1. Create src/defi/protocols/protocol-registry.service.ts following the same registry pattern as StrategyRegistry in core/auth.
2. Register AaveAdapter as a provider in DeFiModule and auto-register it with the registry on module init.
3. Define a ProtocolAdapterMetadata interface so adapters self-describe their supported chains and capabilities.
4. Expose a getAdapter(protocolName: string) method on the registry for runtime protocol selection.
5. Add a controller endpoint GET /api/v1/defi/protocols that lists available protocols.

Definition of Done

• A ProtocolRegistry service exists and auto-discovers all registered protocol adapters.
• Adding a new protocol requires only: (a) create adapter file, (b) register in module providers.

Acceptance Criteria

• ProtocolRegistry service is created with register() and getAdapter() methods
• AaveAdapter is registered as a provider in DeFiModule
• DeFiModule.onModuleInit() registers all adapters with the registry
• GET /api/v1/defi/protocols returns the list of available protocols
• Adding a stub adapter (e.g., CompoundAdapter) requires no changes to the registry
• npm run build succeeds

---

[clintjeff2]

Hello, I have 6 years of experience working on tasks like this and handling similar challenges across backend, frontend, and smart-contract development. I have carefully read and fully understood the task requirements, and I am confident I can deliver a clean, efficient, and well-tested solution promptly. I always ensure high-quality implementation, maintainability, and adherence to best practices.

Pull request in 2 days.

[shadrach68]

I have experience with Backend development and have reviewed the code. I can submit the PR within 24hrs.

[grantfox-oss]

🦊 GrantFox — @shadrach68 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #9)
2. Your PR will be reviewed by the SourceXXL maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@shadrach68's PR #16 was approved and merged by @memplethee-lab.

🏆 @shadrach68: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (783 total points). Track your full progress on GrantFox.

👏 Great work, @shadrach68! Keep contributing to SourceXXL.