feat(registry): add unit tests for registry contract lookup caching c…

[quickweb-stack]

Close: #574

Summary of Changes

1. Created backend/src/services/registry.service.ts : This service handles registry contract lookups with multi-level caching (in-memory L1 and Redis L2) using the existing AdvancedCacheService . Key features include:

   • getContract() : Retrieves contract info with cache-aside pattern
   • getAddress() : Gets just the contract address
   • getVersion() : Gets just the contract version
   • isRegistered() / isActive() : Check contract status
   • invalidateContractCache() / invalidateAllCache() : Cache invalidation methods

2. Created backend/src/services/registry.service.test.ts : Unit tests for all the service methods, mocks dependencies like AdvancedCacheService and stellarService .

3. Updated backend/src/config/env.ts : Added support for REGISTRY_CONTRACT_ID environment variable to configure the registry contract address.
   Now you can use registryService to look up contract information from the registry with caching!

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[quickweb-stack]

Done, Close: #676