fix(svg): build on iOS without @nativescript/canvas

[triniwiz]

Problem

@nativescript/canvas-svg doesn't build on iOS unless @nativescript/canvas is also installed:

canvas-svg/platforms/ios/src/cpp/SVGCommon.h:6:10: fatal error: 'include/v8.h' file not found

The SVG sources compile against the V8 headers, but only canvas (and audio-context) ship them, as the NativeScriptV8 SwiftPM shim. Android isn't affected: its native libraries only link against the NativeScript runtime.

Fix

• SwiftPM shim: ship the same NativeScriptV8 shim (Package.swift, Headers, Sources) from nativescript-v8/ as canvas and audio-context do. A plugin nativescript.config.ts declares it, and the CLI dedupes the same-named CanvasNative package across plugins.
• build.xcconfig: add Headers/include to the search path, as canvas's build.xcconfig does, and build as C++20 for V8 14.9. The shim alone gets include/v8.h to resolve, but the V8 headers then include each other by bare name (cppgc/common.h → "v8config.h"). The flags use their own variable names, so the CLI's xcconfig merge appends them next to canvas's instead of dropping one.

Testing

nx build wasn't available in my checkout, so I assembled the package by hand (published 3.0.0-beta.3 plus this change's assets) and ran it in a NativeScript Vue app on the iPhone 17 Pro simulator, iOS 26.4:

Setup	Result
Before: canvas-svg 3.0.0-beta.3 only	❌ 'include/v8.h' file not found
SwiftPM shim only, no xcconfig flags	❌ 'v8config.h' file not found
This PR, canvas-svg only	✅ builds, SVGs render
This PR + @nativescript/canvas 3.0.0-beta.3	✅ builds, one CanvasNative package, both plugins' header flags merged, no xcconfig conflicts

Android with canvas-svg only builds as before.

Note

audio-context ships the shim but its build.xcconfig has neither the Headers/include flag nor C++20, so it probably hits the same v8config.h error when it's installed without canvas. I haven't tested that.

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