Reorganize repository structure for better organization

- Move backend code to swingmusic/ folder
- Move client applications to root level (swingmusic-android, swingmusic-desktop, swingmusic-webclient)
- Remove intermediate backend/ and clients/ folders
- Update README with new folder structure and setup instructions
- Clean and organized repository layout

swingmusic.spec

@@ -1,62 +0,0 @@
-# -*- mode: python ; coding: utf-8 -*-
-from PyInstaller.utils.hooks import collect_submodules, collect_data_files
-from platform import system, machine
-import pathlib
-
-hiddenimports =[]
-# hiddenimports += collect_submodules('swingmusic')
-datas = [('client.zip', '.')]
-datas += collect_data_files('swingmusic', True, excludes=['**/*.py'], includes=['**/*.*'])
-datas += collect_data_files('flask_openapi3', True, excludes=['**/*.py'], includes=['**/*.*'])
-
-def getFlaskOpenApiPath():
-    return importlib.resources.files("flask_openapi3")
-
-
-
-a = Analysis(
-    ['run.py'],
-    pathex=[],
-    binaries=[],
-    datas=datas,
-    hiddenimports=hiddenimports,
-    hookspath=[],
-    hooksconfig={},
-    runtime_hooks=[],
-    excludes=[],
-    noarchive=False,
-    optimize=0,
-)
-pyz = PYZ(a.pure)
-
-exe = EXE(
-    pyz,
-    a.scripts,
-    a.binaries,
-    a.datas,
-    [],
-    name=f'swingmusic_{system().lower()}_{machine().lower()}',
-    debug=False,
-    bootloader_ignore_signals=False,
-    strip=False,
-    upx=True,
-    upx_exclude=[],
-    runtime_tmpdir=None,
-    console=True,
-    disable_windowed_traceback=False,
-    argv_emulation=False,
-    target_arch=None,
-    codesign_identity=None,
-    entitlements_file=None,
-    icon=[pathlib.Path('src\\swingmusic\\assets\\logo-fill.light.ico')],
-)
-
-coll = COLLECT(
-    exe,
-    a.binaries,
-    a.datas,
-    strip=False,
-    upx=True,
-    upx_exclude=[],
-    name='name_test',
-)