Fix PyInstaller volatility and bundle dependencies (v0.2.8)

- Separated internal ROOT from persistent DATA_DIR to prevent user sites from being saved to the volatile PyInstaller _MEIPASS temp directory.
- Updated unit tests to correctly mock DATA_DIR and ensure complete isolation between tests.
- Fixed binaries.yml and requirements.txt to correctly bundle the pinned Flask/Werkzeug versions, preventing onionshare-cli import failures in the standalone binary.

.github/workflows/binaries.yml

@@ -35,6 +35,7 @@ jobs:
       - name: Install dependencies
         run: |
           pip install -r requirements.txt
+          pip install .
           pip install pyinstaller pyinstaller-hooks-contrib
 
       - name: Download Tor Binaries