Allow creating an allocation with user-specified parameters

[OriolMunoz-da]

Fixes #451

[Copilot]

Pull Request Overview

This pull request implements the "Allocations create" feature by introducing backend support for amulet allocation operations and the corresponding frontend components and API endpoints. Key changes include:

• New backend methods and data types (e.g. EnqueuedAmuletAllocationOperation, AmuletAllocationOperationBatch) added to TreasuryService.scala to handle allocation operations.
• Updates to the API specification (wallet-internal.yaml) to support the new allocation endpoints.
• Frontend modifications including new routes, components (CreateAllocation, AmountInput) and context updates to integrate allocation creation into the wallet UI.

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
apps/wallet/src/main/scala/org/lfdecentralizedtrust/splice/wallet/treasury/TreasuryService.scala	Adds methods to enqueue and execute amulet allocation operations.
apps/wallet/src/main/scala/org/lfdecentralizedtrust/splice/wallet/admin/http/HttpWalletHandler.scala	Implements new HTTP handler endpoints for allocation operations.
apps/wallet/src/main/openapi/wallet-internal.yaml	Extends OpenAPI schema with allocateAmulet endpoints and response definitions.
apps/wallet/frontend/src/routes/allocations.tsx	Creates a new frontend route for allocations.
apps/wallet/frontend/src/contexts/WalletServiceContext.tsx	Adds context support for creating allocations.
apps/wallet/frontend/src/components/CreateAllocation.tsx	Introduces a new React component to create allocations.
apps/wallet/frontend/src/components/AmountInput.tsx	Updates the amount input component to be reusable across views.
apps/wallet/frontend/src/App.tsx	Integrates the new Allocations route into the main app.
apps/common/src/main/scala/org/lfdecentralizedtrust/splice/environment/SpliceLedgerConnection.scala	Updates the CommandId signature and logic to support improved dedup handling.

Comments suppressed due to low confidence (2)

apps/wallet/src/main/openapi/wallet-internal.yaml:1432

• The dummy field in AllocationInstructionResultFailed is used as a placeholder for an empty object. Consider adding a more descriptive comment or an alternative approach so that future developers understand its purpose and any plans for improvement.

dummy: # cannot define an empty object for some reason

apps/common/src/main/scala/org/lfdecentralizedtrust/splice/environment/SpliceLedgerConnection.scala:1310

• [nitpick] The updated handling of the 'discriminator' in CommandId now incorporates each string's length before appending. Please ensure that any consumers relying on the previous string format are updated and that the new format is documented clearly.

.appendedAll(discriminator.flatMap(str => Seq(str.length.toString, str)))

[moritzkiefer-da]

Nice work, thank you!

As discussed:

1. Please add an integration test for the backend that does not go through the frontend
2. In the future keep the backend changes and frontend changes in separate PRs