[Update] Build scripts and configuration: Added new build and install scripts, updated versioning in config files, and improved project structure.

bat/build.bat

@@ -0,0 +1,2 @@
+call .venv/Scripts/activate
+pyinstaller spec/backend.spec --distpath src-tauri/bin --clean --noconfirm --log-level ERROR

bat/build_cuda.bat

@@ -0,0 +1,2 @@
+call .venv_cuda/Scripts/activate
+pyinstaller spec/backend_cuda.spec --distpath src-tauri/bin --clean --noconfirm --log-level ERROR

bat/install.bat

@@ -0,0 +1,25 @@
+REM .venv exists
+if exist .venv (
+    rmdir /s /q .venv
+)
+
+REM make .venv
+python -m venv .venv
+
+REM install packages for .venv
+call .venv/Scripts/activate
+python.exe -m pip install --upgrade pip
+pip install --no-cache-dir --force-reinstall -r requirements.txt
+
+REM if .venv_cuda exists
+if exist .venv_cuda (
+    rmdir /s /q .venv_cuda
+)
+
+REM make .venv_cuda
+python -m venv .venv_cuda
+
+REM install packages for .venv_cuda
+call .venv_cuda/Scripts/activate
+python.exe -m pip install --upgrade pip
+pip install --no-cache-dir --force-reinstall -r requirements_cuda.txt