NFT tweaks

[ouziel-slama]

Replace description with attribute map and add creator/listing views

• mint: replace description: string with attributes: list<attribute> (≤32 entries, unique non-empty keys ≤64B, values ≤2048B), set once at mint
• nft-info: add immutable creator (= mint signer), drop description
• views: add list-nfts, list-nfts-by-creator, count-nfts-by-creator (offset/limit, internal cap), plus get-attributes / get-attribute
• backed by a creator→nft-ids index populated at mint

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Note

Medium Risk
Medium risk because it changes the NFT contract storage and WIT interface (breaking mint/nft-info shape) and introduces new indexing/pagination logic that could affect on-chain data compatibility and query correctness.

Overview
NFT contract API/storage refactor: replaces description with an immutable attributes map set at mint, adds a permanent creator field (mint signer), and updates validation to enforce attribute count/size/uniqueness constraints.

New read APIs: adds paginated list-nfts, list-nfts-by-creator, and count-nfts-by-creator (with internal limit clamp and lenient handling of invalid creators), plus get-attributes/get-attribute views.

Indexing + tests: introduces a per-creator secondary index populated at mint (not affected by transfers) and significantly expands the native NFT contract integration test coverage for attributes, creator invariance, pagination, and edge cases; Cargo.lock is updated for WIT/wasm tooling version resolution.

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