feat(ic-icrc1): add AuthorizedMint/AuthorizedBurn Operation variants

[bogwar]

Summary

• Adds AuthorizedMint and AuthorizedBurn variants to the Operation enum for ICRC-122 block types (122mint/122burn)
• Adds reason field to FlattenedTransaction for CBOR round-trip serialization
• Adds btype-based deserialization and btype assignment in from_transaction()
• Stubs all exhaustive match sites with panics (index-ng, rosetta, test utilities, endpoints) — real implementations in subsequent PRs

Stacked on #9586.

Test plan

• No new runtime behavior — all new code paths are behind panics until endpoints are added in a later PR
• Verified by cargo clippy and existing test suites passing (no new Operation variants are produced yet)

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds scaffolding to support ICRC-122 privileged mint/burn block types by extending the ICRC-1 ledger transaction model and CBOR encoding/decoding, while explicitly stubbing downstream consumers (Rosetta, index-ng, test utilities) until follow-up PRs implement full support.

Changes:

• Add AuthorizedMint / AuthorizedBurn variants to ic_icrc1::Operation.
• Extend transaction flattening/CBOR (de)serialization with reason and btype-based decoding for 122mint / 122burn.
• Add explicit panic stubs at exhaustive match sites across Rosetta, index-ng, and test utilities.

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	Adds new Operation variants, adds reason to flattened tx, and adds btype-based tx decoding + btype assignment in from_transaction().
rs/ledger_suite/icrc1/src/endpoints.rs	Stubs endpoint conversion for new operation variants with a panic.
rs/ledger_suite/icrc1/index-ng/src/main.rs	Stubs indexing logic for new variants with panics.
rs/rosetta-api/icrc1/src/common/storage/types.rs	Stubs Rosetta storage model conversion for new variants with a panic.
rs/rosetta-api/icrc1/src/construction_api/services.rs	Updates Rosetta construction API tests to explicitly panic on new variants.
rs/rosetta-api/icrc1/tests/system_tests.rs	Updates Rosetta system test matching to explicitly panic on new variants.
rs/rosetta-api/icrc1/tests/multitoken_system_tests.rs	Same as above for multitoken system tests.
rs/ledger_suite/test_utils/in_memory_ledger/src/lib.rs	Stubs in-memory ledger block consumer for new variants with a panic.
rs/ledger_suite/icrc1/test_utils/src/lib.rs	Adjusts generators and utilities to compile with the new variants (panic stubs / exclusions).

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