feat: add Windows compatibility for external process execution

This PR introduces cross-platform support for launching external binaries (`ace-lm` and `ace-synth`) on Windows systems.

**Key changes:**
* Introduced `EXE_EXT` constant in `AceStepWorker.h` using `Q_OS_WIN` macro to handle `.exe` extensions automatically.
* Updated binary path construction to ensure `QFileInfo::isExecutable()` and `QProcess` work correctly on Windows.
* The code remains fully compatible with Linux/macOS (extension remains empty).

**Why this is needed:**
On Windows, `QProcess` and `QFileInfo` require the `.exe` suffix to correctly identify and execute binary files. Without this change, the application fails to find the required tools even if they are present in the directory.

README.md

@@ -28,6 +28,7 @@ make -j$(nproc)
 
 ## Building
 
+### Linux / macOS
 ```bash
 git clone https://github.com/IMbackK/aceradio.git
 cd aceradio
@@ -36,6 +37,29 @@ cmake ..
 make -j$(nproc)
 ```
 
+### Windows (Qt6 + CMake)
+
+To build on Windows, ensure you have **CMake** and **Qt6** installed. Run the following commands in **Command Prompt (cmd)** or **PowerShell**:
+
+1. **Configure and Build:**
+```cmd
+git clone https://github.com/IMbackK/aceradio.git
+cd aceradio
+mkdir build
+cmake -B build -DCMAKE_PREFIX_PATH="C:/Qt/6.x.x/msvc2019_64"
+
+# Use --parallel to build using all CPU cores
+# Or use -j N (e.g., -j 4) to limit the number of threads
+cmake --build build --config Release --parallel
+```
+Note: Replace C:/Qt/6.x.x/msvc2019_64 with your actual Qt installation path.
+
+2. **Deploy Dependencies:**
+Run windeployqt to copy necessary Qt libraries to the build folder:
+```cmd
+"C:\Qt\6.x.x\msvc2019_64\bin\windeployqt.exe" --no-translations build\Release\aceradio.exe
+```
+
 ## Setup Paths:
 
 Go to settings->Ace Step->Model Paths and add the paths to the acestep.cpp binaries the models.