feat: add nearby social interactions

_Core/managers/AuthManager.gd

@@ -32,6 +32,7 @@ var _session_generation: int = 0
 var _account_generation: int = 0
 var _refresh_in_flight: bool = false
 var _auth_config_path: String = DEFAULT_AUTH_CONFIG_PATH
+var _show_welcome_after_registration: bool = false
 
 func _ready() -> void:
 	_load_cached_session()
@@ -70,6 +71,11 @@ func get_account_generation() -> int:
 func get_auth_config_path() -> String:
 	return _auth_config_path
 
+func consume_registration_welcome() -> bool:
+	var should_show: bool = _show_welcome_after_registration
+	_show_welcome_after_registration = false
+	return should_show
+
 func login(identifier: String, password: String) -> void:
 	var normalized_identifier := identifier.strip_edges()
 	if normalized_identifier.is_empty():
@@ -297,6 +303,7 @@ func _on_register_response(success: bool, data: Dictionary, error_info: Dictiona
 		register_failed.emit("注册响应缺少 access_token")
 		return
 
+	_show_welcome_after_registration = true
 	_emit_event(EventNames.AUTH_REGISTER_SUCCESS, {
 		"user": get_current_user()
 	})