Cardano Updates

Renamed .claude/skills/regenerate-testdata-db/ to
.claude/skills/cardano-rosetta-java-regenerate-testdata-db/ to avoid
collisions with same-named skills the user may have in other projects.
Updated the SKILL.md `name:` frontmatter field and the in-doc path
reference to the bundled regen-devkit-db.sh.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Per-project skill that wraps the devkit fixture regeneration. Triggers on
phrases like 'regenerate testdata', 'rebuild devkit.db', or on CI failures
mentioning 'Table CIP26_METADATA not found' (which indicate the committed
testData/devkit.db.mv.db is stale relative to the current yaci-store schema).

The skill folder contains:
- SKILL.md     - workflow, common failure modes, categorisation of the
                 fixture-drift test adjustments
- regen-devkit-db.sh - the actual orchestration script, moved out of
                       scripts/ so the skill is self-contained

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

The previous H2 fixture (testData/devkit.db.mv.db) still carried the old
ft_offchain_metadata / ft_offchain_logo / metadata_reference_nft tables.
Indexer migrations against the new yaci-store snapshot create cip26_metadata
and cip68_metadata, so 15 controller tests were failing with "Table
CIP26_METADATA not found" / 500 errors.

Regenerated end-to-end via scripts/regen-devkit-db.sh:
- yaci-cli boots a local devnet (no Docker required)
- topup_addresses env var funds the two test addresses
- rosetta yaci-indexer runs with the h2-testdata profile, writing the
  V2 schema into testData/devkit.db
- TestDataGenerator submits the canonical transaction set
- two SQL UPDATE statements apply the genesis-block workaround
- script verifies cip26_metadata + cip68_metadata are present before exit

Minor test adjustments to match the regenerated fixture:
- SearchControllerTest: total_count 27 -> 45 (more transactions in the new
  run; account-filter count of 6 unchanged)
- AccountBalanceApiTest.accountBalanceMintedTokenAndEmptyName_TestORG:
  locate MyAsset by symbol filter rather than positional index, since
  devkit mint order is not guaranteed across regens
- AccountCoinsApiTest.accountCoinsMultipleSpecifiedCurrencies_Test: expect
  decimals=0 for MyAsset (no CIP-26 row exists for it; TokenRegistry
  decimals resolution is covered by TokenQueryServiceTest)
- MetadataApiTest.combineWithMetadataTest: TTL 735 -> 155 (chain-tip slot
  is shorter on the freshly-regenerated devkit)

All 995 api tests now pass (8 skipped).

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Yaci-store assets-ext renamed its tables and merged the logo column into
cip26_metadata. Retarget rosetta entities, drop the now-redundant logo
table + parallel-fetch plumbing, and remove the label filter that
silently hid latest reference-NFT rows tagged with a co-minted prefix.

- Entities: TokenMetadataEntity -> cip26_metadata (+ logo column);
  MetadataReferenceNftEntity -> cip68_metadata; TokenLogoEntity removed.
- Repository: drop label filter from findLatestByConcatenatedKeys to
  match upstream "latest row regardless of label" semantics.
- TokenQueryServiceImpl: drop StructuredTaskScope and TokenLogoRepository;
  single CIP-26 query reads logo on the same row. TOKEN_REGISTRY_LOGO_FETCH
  retained as a wire-gating flag (no longer saves a DB query).
- Tests: rewrite TokenQueryServiceTest for the new shape (64 tests pass).
- Docs: update token-metadata.md data-flow diagram and SQL examples.
- Bump yaci-store snapshot to 2.1.0-pre4-ca14bd5-SNAPSHOT.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>