Story 1.3: Implement Naming Convention Transformation Logic

[j-d-ha]

Priority: P0 - Blocker
Tier: 1 - Foundation
Effort: Medium (4-6 hours)

Description

Implement convention transformation in generator:

• CamelCase: OwnerId → ownerId
• SnakeCase: OwnerId → owner_id
• Exact: no transformation

Files to modify

• src/LayeredCraft.DynamoMapper.Generators/Utilities/NamingConventionTransformer.cs (new)
• src/LayeredCraft.DynamoMapper.Generators/Models/PropertyMappingInfo.cs (update to use transformer)
• src/LayeredCraft.DynamoMapper.Generators/Templates/Mapper.scriban (if needed)

Acceptance criteria

• Correct transformation for all conventions
• Unit tests for transformer
• Generated field names match convention

[j-d-ha]

Closed in #7