User Story
As a liquidity provider, I want to be able to set my availability independently for each currency I support, so that I can manage my liquidity more effectively and control which currencies I'm available to process at any given time.

Acceptance Criteria

1. GIVEN a provider profile exists
   WHEN the provider updates their availability
   THEN they should be able to specify which currencies they are available for

2. GIVEN a provider is available for specific currencies
   WHEN an order is created for a currency
   THEN the provider should only be matched if they are available for that specific currency

3. GIVEN a provider profile is created
   WHEN the provider specifies their supported currencies
   THEN they should be able to set availability for each currency independently

4. GIVEN a provider's availability is checked
   WHEN the check is performed for a specific currency
   THEN the system should only return true if the provider is available for that currency

Tech Details

1. Database Changes:

   • Remove is_available boolean field from provider_profiles table
   • Add available_for text[] field to store currency codes
   • Create migration for schema changes

2. Code Changes:

   • Update Ent schema in ent/schema/providerprofile.go
   • Modify type definitions in types/types.go
   • Update controller logic in controllers/accounts/profile.go
   • Update provider matching logic in relevant services

3. API Changes:

   • Update provider profile creation/update endpoints to accept currency-specific availability
   • Update response schemas to include available currencies

Notes/Assumptions

• Currency codes in available_for must be valid ISO currency codes
• The change should be backward compatible during migration
• Existing providers will need to be migrated to specify their available currencies