refactor(erc1155): modular facet architecture with exportSelectors

[aapsi]

Summary

Refactors the ERC1155 implementation to match the modular facet pattern established by ERC20
and ERC721. Splits the monolithic ERC1155Facet.sol into focused facets and modules per
concern, and adds exportSelectors() to each facet as a selector discovery mechanism per
EIP-8153.

Changes Made

• Deleted pre-refactor root-level files: ERC1155Facet.sol, ERC1155DataFacet.sol,
  ERC1155Mod.sol
• Added Approve/ERC1155ApproveFacet.sol — external setApprovalForAll
• Added Approve/ERC1155ApproveMod.sol — internal free function for approval logic
• Added Burn/ERC1155BurnFacet.sol — external burnERC1155 and burnERC1155Batch with
  owner/operator authorization
• Added Burn/ERC1155BurnMod.sol — internal free functions for burn logic
• Added Data/ERC1155DataFacet.sol — external read-only functions: balanceOf,
  balanceOfBatch, isApprovedForAll
• Added Metadata/ERC1155MetadataFacet.sol — external uri with per-token and base URI
  support
• Added Metadata/ERC1155MetadataMod.sol — internal free functions: setURI, setBaseURI,
  setTokenURI
• Added Mint/ERC1155MintMod.sol — internal free functions: mintERC1155,
  mintERC1155Batch with ERC1155Receiver validation
• Added Transfer/ERC1155TransferFacet.sol — external safeTransferFrom and
  safeBatchTransferFrom with ERC1155Receiver validation
• Added Transfer/ERC1155TransferMod.sol — internal free functions for transfer logic
• Added exportSelectors() to all 5 facets (Approve, Burn, Data, Metadata, Transfer)
• Function naming follows token-prefixed convention: mintERC1155, burnERC1155, etc.
  (consistent with mintERC20, burnERC721)
• Two diamond storage slots: keccak256("erc1155") for core token data,
  keccak256("erc1155.metadata") for metadata
• ERC-6093 compliant error names throughout
• ERC-8042 compliant storage struct annotations

Checklist

Before submitting this PR, please ensure:

• Code follows the Solidity feature ban - No inheritance, constructors, modifiers,
  public/private variables, external library functions, using for directives, or
  selfdestruct

• Code follows Design Principles - Readable, uses diamond storage, favors composition
  over inheritance

• Code matches the codebase style - Consistent formatting, documentation, and
  patterns (e.g. ERC20Facet.sol)

• Code is formatted with forge fmt

• Existing tests pass - Run tests to be sure existing tests pass.

• All tests pass - Run forge test and ensure everything works

• Documentation updated - If applicable, update relevant documentation

Make sure to follow the
contributing guidelines.

Additional Notes

Existing test files still reference the deleted pre-refactor files and will need to be
updated.

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