v0.0.4

Changes

• Refactored ifc_dxf core into ifc_dxf/core/ package (no Blender dependency)
• DXF template moved to ifc_dxf/templates/
• Annotative text styles and cartiglio auto-fill from IFC drawing data
• Annotation scale XREC updated per viewport scale
• Test infrastructure: tests/ifc_dxf/ with pytest suite and first IFC fixture
• English documentation in ifc_dxf/README.md