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

src/swingmusic/api/plugins/__init__.py

@@ -1,103 +0,0 @@
-from flask_openapi3 import Tag
-from flask_openapi3 import APIBlueprint
-from pydantic import BaseModel, Field
-from swingmusic.api.auth import admin_required
-from swingmusic.config import UserConfig
-from swingmusic.db.userdata import PluginTable
-from swingmusic.plugins.lastfm import LastFmPlugin
-from swingmusic.utils.auth import get_current_userid
-
-bp_tag = Tag(name="Plugins", description="Manage plugins")
-api = APIBlueprint("plugins", __name__, url_prefix="/plugins", abp_tags=[bp_tag])
-
-
-@api.get("/")
-def get_all_plugins():
-    """
-    List all plugins
-    """
-    plugins = PluginTable.get_all()
-    return {"plugins": plugins}
-
-
-class PluginBody(BaseModel):
-    plugin: str = Field(description="The plugin name", example="lyrics")
-
-
-class PluginActivateBody(PluginBody):
-    active: bool = Field(
-        description="New plugin active state", example=False, default=False
-    )
-
-
-@api.post("/setactive")
-@admin_required()
-def activate_deactivate_plugin(body: PluginActivateBody):
-    """
-    Activate/Deactivate plugin
-    """
-    name = body.plugin
-    PluginTable.activate(name, body.active)
-
-    return {"message": "OK"}, 200
-
-
-class PluginSettingsBody(PluginBody):
-    settings: dict = Field(
-        description="The new plugin settings", example={"key": "value"}
-    )
-
-
-@api.post("/settings")
-@admin_required()
-def update_plugin_settings(body: PluginSettingsBody):
-    """
-    Update plugin settings
-    """
-    plugin = body.plugin
-    settings = body.settings
-
-    if not plugin or not settings:
-        return {"error": "Missing plugin or settings"}, 400
-
-    PluginTable.update_settings(plugin, settings)
-    plugin = PluginTable.get_by_name(plugin)
-
-    return {"status": "success", "settings": plugin.settings}
-
-
-class LastFmSessionBody(BaseModel):
-    token: str = Field(description="The token to use to create the session")
-
-
-@api.post("/lastfm/session/create")
-def create_lastfm_session(body: LastFmSessionBody):
-    """
-    Create a Last.fm session
-    """
-    if not body.token:
-        return {"error": "Missing token"}, 400
-
-    lastfm = LastFmPlugin(current_userid=get_current_userid())
-    session_key = lastfm.get_session_key(body.token)
-
-    if session_key:
-        config = UserConfig()
-        current_user = get_current_userid()
-        config.lastfmSessionKeys[str(current_user)] = session_key
-        config.lastfmSessionKeys = config.lastfmSessionKeys
-
-    return {"status": "success", "session_key": session_key}
-
-
-@api.post("/lastfm/session/delete")
-def delete_lastfm_session():
-    """
-    Delete the Last.fm session
-    """
-    config = UserConfig()
-    current_user = get_current_userid()
-    config.lastfmSessionKeys[str(current_user)] = ""
-    config.lastfmSessionKeys = config.lastfmSessionKeys
-
-    return {"status": "success"}