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/start_info_logger.py

@@ -1,18 +0,0 @@
-from swingmusic.settings import TCOLOR, Metadata, Paths
-from swingmusic.utils.network import get_ip
-
-
-def log_startup_info(host: str, port: int):
-    print(f"{TCOLOR.HEADER}Swing Music v{Metadata.version} {TCOLOR.ENDC}")
-
-    addresses = [host]
-
-    if host == "0.0.0.0":
-        remote_ip = get_ip()
-        addresses.extend(["127.0.0.1"] + ([remote_ip] if remote_ip else []))
-
-    print("Server running on:\n")
-    for address in addresses:
-        print(f"{TCOLOR.OKGREEN}http://{address}:{port}{TCOLOR.ENDC}")
-
-    print(f"\n{TCOLOR.YELLOW}Data folder: {Paths().config_dir}{TCOLOR.ENDC}\n")