feat(icrc1): add ICRC-123 freeze Operation variants, index-ng, and .did updates

[bogwar]

Summary

• Add FreezeAccount, UnfreezeAccount, FreezePrincipal, UnfreezePrincipal variants to Operation enum with CBOR encoding/decoding in Transaction
• Add endpoint conversion support (Operation ↔ GetTransactionsResponse) with proper btype mapping for all 4 freeze/unfreeze block types
• Update index-ng to treat freeze/unfreeze operations as non-balance-affecting (no index changes needed)
• Add Rosetta stubs for freeze operations (full Rosetta support in follow-up PR)

Stacked on #9530.

Test plan

• Existing index-ng tests continue to pass — freeze/unfreeze operations correctly handled as no-ops for balance tracking
• Rosetta system tests pass — new operation variants are matched in all exhaustive match arms

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR adds support for ICRC-123 freeze/unfreeze operations to the ledger suite. The PR extends the Operation enum with four new variants (FreezeAccount, UnfreezeAccount, FreezePrincipal, UnfreezePrincipal), adds serialization/deserialization support through the FlattenedTransaction struct, implements endpoint conversion in Block ↔ Transaction conversions, and adds appropriate stubs for Rosetta support. The freeze operations are correctly treated as non-balance-affecting operations throughout the codebase.

Changes:

• Added four freeze/unfreeze operation variants to the Operation enum in rs/ledger_suite/icrc1/src/lib.rs
• Extended FlattenedTransaction with account and principal fields to support serialization
• Implemented conversions between Operation/Transaction and FlattenedTransaction for all freeze variants
• Added endpoint conversion support in rs/ledger_suite/icrc1/src/endpoints.rs mapping freeze operations to FreezeAccountAction and FreezePrincipalAction
• Updated all exhaustive pattern matches across the codebase to include the four new operation variants
• Updated error message in Rosetta tests from "ICRC-124 operations" to "Management operations" to reflect inclusion of ICRC-123 operations
• Added unimplemented!() stubs for freeze operations in Rosetta with notes on follow-up PR

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rs/ledger_suite/icrc1/src/lib.rs	Added four new Operation variants with full serialization/deserialization support and proper handling in apply_transaction as no-ops
rs/ledger_suite/icrc1/src/endpoints.rs	Added Block→Transaction conversion for all four freeze operations
rs/ledger_suite/icrc1/index-ng/src/main.rs	Updated pattern matches to handle freeze operations as non-balance-affecting
rs/ledger_suite/icrc1/test_utils/src/lib.rs	Updated test utilities to properly handle freeze operations as no-ops in balance tracking
rs/ledger_suite/test_utils/in_memory_ledger/src/lib.rs	Updated in-memory ledger to handle freeze operations as no-ops
rs/rosetta-api/icrc1/src/common/storage/types.rs	Added unimplemented! stub with follow-up PR note
rs/rosetta-api/icrc1/src/construction_api/services.rs	Updated test to include new operation variants with corrected error message
rs/rosetta-api/icrc1/tests/system_tests.rs	Updated exhaustive match arm to include four new operation variants
rs/rosetta-api/icrc1/tests/multitoken_system_tests.rs	Updated exhaustive match arm to include four new operation variants

All changes are consistent with the implementation pattern established by ICRC-124 management operations (Pause, Unpause, Deactivate). The implementation correctly:

• Imports constants from icrc_ledger_types
• Uses existing action types (FreezeAccountAction, FreezePrincipalAction)
• Treats freeze operations as non-balance-affecting throughout the codebase
• Provides clear unimplemented stubs with notes about follow-up work

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