Update missing init for VectorImageLayer

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Completes missing vector-image layer initialization and adds CoreGraphics image conversion utilities.

Changes:

• Implements `VectorImageLayer` initializers for CoreUI vector images, plus direct `CGPDFPage`/`CGSVGDocument` entry points (when CoreGraphics + CoreUI are available).
• Adds drawable/cached `VectorImageContents` implementations that render vector content into an `ORBDisplayList` and optionally rasterize to `CGImage`.
• Introduces protobuf encode/decode scaffolding for `VectorImageLayer` using display-list contents + size.
• Adds `Image` initializers from `CGImage` and CoreGraphics helpers, including a `_CGBitmapContextCreate` shim for consistent bitmap context creation.
• Updates the pinned revision of the DarwinPrivateFrameworks dependency.

Technical Notes: Vector-layer paths are gated behind canImport(CoreGraphics) and OPENSWIFTUI_LINK_COREUI, and retain catalog references when sourced from bundle-backed CoreUI catalogs.

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[augmentcode]

Review completed. 3 suggestions posted.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 259 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.17%. Comparing base (469a09a) to head (981af91).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../OpenSwiftUICore/View/Image/VectorImageLayer.swift	0.00%	132 Missing ⚠️
Sources/OpenSwiftUICore/View/Image/Image.swift	0.00%	114 Missing ⚠️
...penSwiftUICore/View/Image/CGImageConversions.swift	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #825      +/-   ##
==========================================
- Coverage   27.33%   27.17%   -0.16%     
==========================================
  Files         667      667              
  Lines       42706    42963     +257     
==========================================
+ Hits        11672    11674       +2     
- Misses      31034    31289     +255     

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