feat: expand multiplayer, chat, and release support

- add network NPC synchronization and dialogue interactions
- add world bulletin publishing and display
- improve authentication, session refresh, and appearance sync
- synchronize player direction and movement animations
- improve input focus and progressive Web loading
- add macOS/Windows builds and deployment configuration
- include required fonts, shaders, and runtime assets

scenes/ui/CafeCompanionRecruitmentPanel.gd

@@ -131,7 +131,9 @@ func _render_service_points() -> void:
 		var index := servicePointOption.get_item_count()
 		servicePointOption.add_item(_format_service_point_option(point))
 		servicePointOption.set_item_metadata(index, pointId)
-		if selectedIndex < 0 and not _point_has_companion(point):
+		var isOccupied := _point_has_companion(point)
+		servicePointOption.set_item_disabled(index, isOccupied)
+		if selectedIndex < 0 and not isOccupied:
 			selectedIndex = index
 
 	if servicePointOption.get_item_count() <= 0:
@@ -139,7 +141,14 @@ func _render_service_points() -> void:
 		submitButton.disabled = true
 		return
 
-	servicePointOption.select(selectedIndex if selectedIndex >= 0 else 0)
+	if selectedIndex < 0:
+		servicePointOption.select(-1)
+		submitButton.disabled = true
+		fetchModelsButton.disabled = _isSubmitting
+		_set_status("当前陪伴位均已被占用", true)
+		return
+
+	servicePointOption.select(selectedIndex)
 	submitButton.disabled = _isSubmitting
 	fetchModelsButton.disabled = _isSubmitting
 	_set_status("填写人设和代理配置后可登记", false)
@@ -227,6 +236,10 @@ func _build_payload() -> Dictionary:
 	if servicePointId.is_empty():
 		_set_status("请选择陪伴位", true)
 		return {}
+	if not _is_service_point_available(servicePointId):
+		_set_status("该陪伴位已被占用，请选择其他空位", true)
+		_request_service_points()
+		return {}
 	if personaName.is_empty():
 		_set_status("请填写人设名称", true)
 		personaNameInput.grab_focus()
@@ -293,6 +306,15 @@ func _selected_service_point_id() -> String:
 		return ""
 	return str(servicePointOption.get_item_metadata(selectedIndex)).strip_edges()
 
+func _is_service_point_available(servicePointId: String) -> bool:
+	for pointVariant in _servicePoints:
+		if not (pointVariant is Dictionary):
+			continue
+		var point: Dictionary = pointVariant
+		if str(point.get("id", "")).strip_edges() == servicePointId:
+			return not _point_has_companion(point)
+	return false
+
 func _setup_protocol_options() -> void:
 	protocolOption.clear()
 	protocolOption.add_item("OpenAI", 0)