Fix PyInstaller build failure caused by enum34 package

The enum34 package is an obsolete backport of Python's enum module
and is incompatible with PyInstaller on Python 3.4+. It was being
pulled in as a transitive dependency by pvporcupine (part of
RealtimeSTT's dependencies).

Changes:
- All build scripts now remove enum34 before running PyInstaller
  - build.bat, build-cuda.bat (Windows)
  - build.sh, build-cuda.sh (Linux)
- Added "uv pip uninstall -q enum34" step after cleaning builds
- Removed attempted pyproject.toml override (not needed with this fix)

This fix allows PyInstaller to bundle the application without errors
while still maintaining all RealtimeSTT functionality (enum is part
of Python stdlib since 3.4).

Resolves: PyInstaller error "enum34 package is incompatible"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

build.bat

@@ -10,6 +10,10 @@ echo Cleaning previous builds...
 if exist build rmdir /s /q build
 if exist dist rmdir /s /q dist
 
+REM Remove enum34 if present (incompatible with PyInstaller)
+echo Removing enum34 (if present)...
+uv pip uninstall -q enum34 2>nul
+
 REM Build with PyInstaller
 echo Running PyInstaller...
 uv run pyinstaller local-transcription.spec