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Build KivyThorVG.xcframework for iOS wheels (#9301)

* Add Meson cross-files for iOS device and simulator

tools/meson-cross-ios-device.ini  — arm64, iphoneos SDK, iOS 16.0
tools/meson-cross-ios-sim.ini     — universal arm64+x86_64, iphonesimulator
                                    SDK, iOS 16.0 simulator

iOS 16.0 is chosen to match ANGLE xcframework (the highest minimum in
the existing ios-kivy-dependencies bundle; SDL3 is 11.0, ANGLE is 16.0).

Both files deliberately omit runtime-variable values (SDK sysroot, -arch
flags, deployment-target flag).  Those are injected by build_thorvg.sh
via -Dc_args / -Dcpp_args so the cross-file is reusable across SDK
updates without a forced reconfigure.

pkg-config is disabled (pkgconfig = 'false') to prevent Meson from
accidentally resolving Homebrew macOS host libraries while
cross-compiling for iOS.

Sanity checked: `meson setup --cross-file` on a hello-world project
succeeds for both files; Host machine shows aarch64/darwin as expected.

Part of feature/thorvg-ios-wheel — Section 3 step 1.

Made-with: Cursor

* Extend build_thorvg.sh with THORVG_IOS cross-compile mode; add macos_framework_wrapper.sh

Bring tools/macos_framework_wrapper.sh from feature/thorvg-cython (Phase 1)
unmodified.  Extend tools/build_thorvg.sh with THORVG_IOS support:

* New env var: THORVG_IOS=iphoneos|iphonesimulator
  - Forces THORVG_SHARED=1 (xcframework slices must be dylibs)
  - Forces THORVG_MACOS_UNIVERSAL=0 (not building for the macOS host)
  - Validates the value; emits FATAL if anything else is passed

* Slice parameters (resolved from _SCRIPT_DIR so cross-files are found
  regardless of CWD):
  iphoneos        : -arch arm64, -mios-version-min=16.0,
                    meson-cross-ios-device.ini
  iphonesimulator : -arch arm64 -arch x86_64,
                    -mios-simulator-version-min=16.0,
                    meson-cross-ios-sim.ini

  iOS 16.0 matches the ANGLE xcframework (highest existing minimum
  in the Kivy iOS bu... (continued)

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