Implement Bill of Materials Submodel (IDTA 02011-1-1)

[Freezor]

Motivation

As a DPP architect, I want to represent hierarchical component structures, In order to enable traceability and circularity analysis.

Is your feature request related to a problem? Please describe.
There is currently no standardized representation for hierarchical product composition.

Describe the solution you'd like
Implement:

• BillOfMaterialsBuilder
• Support for:
  • Hierarchical assemblies
  • Component references (SubmodelReference)
  • Quantity + unit modeling
• Validation rules:
  • No circular references
  • Unique component identifiers
  • Structural consistency

Describe alternatives you've considered
Flat property lists. Rejected due to lack of traceability.

Additional context
Critical for repairability, spare part logic, and recycling flows.

Acceptance Criteria

• Hierarchical modeling supported
• Reference integrity validation implemented
• Unit tests for nested BOM structures

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• Implement Product Carbon Footprint Submodel (IDTA 02023-1-0) #9

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