feat: Add version checking and display

Integrated version checking into `cli_api.py` and `cli.py`

core/cli_api.py

@@ -47,6 +47,7 @@ class Command(Enum):
     CONFIGURE_WARP = os.path.join(SCRIPT_DIR, 'warp', 'configure.sh')
     STATUS_WARP = os.path.join(SCRIPT_DIR, 'warp', 'status.sh')
     SERVICES_STATUS = os.path.join(SCRIPT_DIR, 'services_status.sh')
+    VERSION = os.path.join(SCRIPT_DIR, 'hysteria2', 'version.sh')
 
 # region Custom Exceptions
 
@@ -500,5 +501,16 @@ def get_services_status() -> dict[str, bool] | None:
     '''Gets the status of all project services.'''
     if res := run_cmd(['bash', Command.SERVICES_STATUS.value]):
         return json.loads(res)
+
+
+def show_version() -> str | None:
+    """Displays the currently installed version of the panel."""
+    return run_cmd(['bash', Command.VERSION.value, 'show-version'])
+
+
+def check_version() -> str | None:
+    """Checks if the current version is up-to-date and displays changelog if not."""
+    return run_cmd(['bash', Command.VERSION.value, 'check-version'])
+
 # endregion
 # endregion