[CHIA-4363] Delete NFT Bulk Minting endpoints

[Quexington]

Note

Medium Risk
Removes a public wallet RPC capability and large mint code paths; clients relying on nft_mint_bulk will break, though core single-mint behavior remains.

Overview
Removes NFT bulk minting from the wallet stack: the nft_mint_bulk RPC handler, client stub, and RPC metadata entry are deleted, along with mint_from_did and mint_from_xch on NFTWallet (intermediate-launcher chunked mint flows).

The entire test_nft_bulk_mint.py suite (~625 lines) is removed. nft_wallet.py import cleanup drops unused DID puzzle / singleton helpers tied to those paths.

Single-NFT minting (generate_new_nft, NFTMintNFTRequest) and other bulk operations (set_bulk_nft_did, bulk_transfer_nft, nft_set_did_bulk, nft_transfer_bulk) are unchanged.

^{Reviewed by Cursor Bugbot for commit a34e7ef. Bugbot is set up for automated code reviews on this repo. Configure here.}

[coveralls-official]

Coverage Report for CI Build 32311884604

Coverage decreased (-0.01%) to 90.187%

Details

• Coverage decreased (-0.01%) from the base build.
• Patch coverage: 2 of 2 lines across 1 file are fully covered (100%).
• 15 coverage regressions across 8 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

15 previously-covered lines in 8 files lost coverage.

File	Lines Losing Coverage	Coverage
chia/wallet/did_wallet/did_wallet.py	5	87.69%
chia/_tests/core/util/test_lockfile.py	3	88.5%
chia/timelord/timelord.py	2	71.15%
chia/full_node/full_node.py	1	84.3%
chia/server/server.py	1	80.15%
chia/_tests/simulation/test_simulation.py	1	93.84%
chia/wallet/wallet_node.py	1	84.9%
chia/wallet/wallet_state_manager.py	1	92.09%

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Coverage Stats

Relevant Lines:	126201
Covered Lines:	116370
Line Coverage:	92.21%
Relevant Branches:	24836
Covered Branches:	19846
Branch Coverage:	79.91%
Branches in Coverage %:	Yes
Coverage Strength:	1.84 hits per line

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💛 - Coveralls