macOS non-bundle build cannot load Vulkan

### Current Behavior

When building Cemu on Mac, the build with default settings is not able to launch games, while the bundled (option `-DMACOS_BUNDLE=ON`) is. I looked through the logs and found this:
```
[18:02:47.090] Vulkan loader not available.
[18:02:49.817] Vulkan cant list devices because Vulkan loader failed
```
It looks like the MoltenVK library is not able to be found. I looked to find what the bundle does differently and found this: https://github.com/cemu-project/Cemu/blob/f801fc1fe85f1e3444f0c1aa7636f52d7c1b7966/src/CMakeLists.txt#L109-L114
This copies the `libMoltenVK` dylib into the Frameworks directory, and adds the directory to the runtime path.

So far, I've tried adding
```
  find_library(MOLTENVK_LIB MoltenVK)
  if(MOLTENVK_LIB)
    target_link_libraries(CemuCafe PRIVATE ${MOLTENVK_LIB})
  endif()
```
to [this block](https://github.com/cemu-project/Cemu/blob/f801fc1fe85f1e3444f0c1aa7636f52d7c1b7966/src/Cafe/CMakeLists.txt#L536-L538), as well as setting `LDFLAGS` to `-L/opt/homebrew/opt/molten-vk/lib -lMoltenVK`, and confirmed with `otool` that the dylib appears in the load commands:
```
Load command 13
          cmd LC_LOAD_DYLIB
      cmdsize 80
         name /opt/homebrew/opt/molten-vk/lib/libMoltenVK.dylib (offset 24)
   time stamp 2 Wed Dec 31 16:00:02 1969
      current version 1.0.0
compatibility version 1.0.0
```
However, this still has not worked.

The following workarounds have succeeded:
1. Using the app bundle with `-DMACOS_BUNDLE=ON`
2. Adding a new runtime path to the binary with `install_name_tool -add_rpath /opt/homebrew/lib bin/Cemu_release`
3. Symlinking the dylib into the existing rpath: `ln -s /opt/homebrew/Cellar/molten-vk/1.3.0/lib/libMoltenVK.dylib build/vcpkg_installed/arm64-osx/lib/`

Any ideas for a way to resolve this through cmake instead of manually?

### Expected Behavior

The Mac non-bundle build should be able to launch games with the Vulkan renderer

### Steps to Reproduce

1. Follow the macOS build steps: https://github.com/cemu-project/Cemu/blob/main/BUILD.md#build-cemu-using-cmake
2. Launch the `./bin/Cemu_release` executable
3. Navigate to Options->General Settings->Graphics and observe the only available Graphics API is OpenGL

### System Info (Optional)

OS: macOS 15.4.1
GPU: Apple M4


### Emulation Settings (Optional)

_No response_

### Logs (Optional)

[log.txt](https://github.com/user-attachments/files/20152630/log.txt)

[]