[FXC-6484] Add CADDesignIntent model and design_intent field to GeometryEntityInfo

[andrzej-krupka]

Summary

• Add CADDesignIntent Pydantic model (design_intent.py): represents the feature tree extracted from native CAD formats (features with name, type, parameters, and child features).
• Add design_intent field to GeometryEntityInfo: optional, populated only when the geometry was imported from a native format that exposes the feature tree.
• Remove entity_id from BodyComponentInfo: no longer needed after per-occurrence UUID assignment is handled in CADToGeometry --instanced (compute-side change, flexcompute/compute#4412).

Test plan

• GeometryEntityInfo serializes/deserializes with design_intent: null for STEP imports
• GeometryEntityInfo serializes/deserializes with populated design_intent for native CAD imports
• Existing entity_info tests pass without entity_id field

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Note

Medium Risk
Adds a new optional design_intent payload to GeometryEntityInfo, which changes the entity-info JSON schema and could affect serialization/compatibility for geometry metadata consumers.

Overview
Introduces a new CADDesignIntent/CADFeature Pydantic model (design_intent.py) to represent native-CAD feature-tree metadata, including feature relationships, referenced/produced entity IDs, and parameter properties.

Extends GeometryEntityInfo to optionally carry this metadata via a new design_intent: Optional[CADDesignIntent] field, enabling entity-info JSON to include feature-tree context when available while remaining null for formats without it.

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