Fix the MQTT node, suggest message names, and drop Items

- MQTT nodes failed to build: the topic map was renamed to talk in ports, but
  __slots__ still declared the old name, so every MQTT node raised
  AttributeError. Building one of each node type is now a test, since __slots__
  makes this failure invisible until someone places the node.
- Port names offer the messages already in play: everything published is worth
  reading, and an input nobody provides yet is worth publishing. A message only
  connects when both ends spell it the same way, so choosing beats typing.
- Adding a port focuses its name field.
- Dragging onto an input that already reads something offers the extra port as
  well as the replacement — an MQTT or InfluxDB node usually wants both.
- The template's Item model, its routes, screens and table are gone.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016WzrvW7rjQbynnhF6pxh6i

frontend/src/client/sdk.gen.ts

@@ -3,7 +3,7 @@
 import type { CancelablePromise } from './core/CancelablePromise';
 import { OpenAPI } from './core/OpenAPI';
 import { request as __request } from './core/request';
-import type { FlowsReadFlowsResponse, FlowsReadNodeTypesResponse, FlowsReadFlowData, FlowsReadFlowResponse, FlowsSaveFlowData, FlowsSaveFlowResponse, FlowsDeleteFlowData, FlowsDeleteFlowResponse, FlowsReadNodeSourceData, FlowsReadNodeSourceResponse, FlowsSaveNodeSourceData, FlowsSaveNodeSourceResponse, FlowsValidateFlowData, FlowsValidateFlowResponse, FlowsRunFlowData, FlowsRunFlowResponse, FlowsTriggerNodeData, FlowsTriggerNodeResponse, FlowsReadFlowStateData, FlowsReadFlowStateResponse, ItemsReadItemsData, ItemsReadItemsResponse, ItemsCreateItemData, ItemsCreateItemResponse, ItemsReadItemData, ItemsReadItemResponse, ItemsUpdateItemData, ItemsUpdateItemResponse, ItemsDeleteItemData, ItemsDeleteItemResponse, LoginLoginAccessTokenData, LoginLoginAccessTokenResponse, LoginTestTokenResponse, LoginRecoverPasswordData, LoginRecoverPasswordResponse, LoginResetPasswordData, LoginResetPasswordResponse, LoginRecoverPasswordHtmlContentData, LoginRecoverPasswordHtmlContentResponse, PrivateCreateUserData, PrivateCreateUserResponse, SecretsReadSecretsResponse, SecretsSaveSecretData, SecretsSaveSecretResponse, SecretsDeleteSecretData, SecretsDeleteSecretResponse, UsersReadUsersData, UsersReadUsersResponse, UsersCreateUserData, UsersCreateUserResponse, UsersReadUserMeResponse, UsersDeleteUserMeResponse, UsersUpdateUserMeData, UsersUpdateUserMeResponse, UsersUpdatePasswordMeData, UsersUpdatePasswordMeResponse, UsersRegisterUserData, UsersRegisterUserResponse, UsersReadUserByIdData, UsersReadUserByIdResponse, UsersUpdateUserData, UsersUpdateUserResponse, UsersDeleteUserData, UsersDeleteUserResponse, UtilsTestEmailData, UtilsTestEmailResponse, UtilsHealthCheckResponse } from './types.gen';
+import type { FlowsReadFlowsResponse, FlowsReadNodeTypesResponse, FlowsReadFlowData, FlowsReadFlowResponse, FlowsSaveFlowData, FlowsSaveFlowResponse, FlowsDeleteFlowData, FlowsDeleteFlowResponse, FlowsReadNodeSourceData, FlowsReadNodeSourceResponse, FlowsSaveNodeSourceData, FlowsSaveNodeSourceResponse, FlowsValidateFlowData, FlowsValidateFlowResponse, FlowsRunFlowData, FlowsRunFlowResponse, FlowsTriggerNodeData, FlowsTriggerNodeResponse, FlowsReadFlowStateData, FlowsReadFlowStateResponse, LoginLoginAccessTokenData, LoginLoginAccessTokenResponse, LoginTestTokenResponse, LoginRecoverPasswordData, LoginRecoverPasswordResponse, LoginResetPasswordData, LoginResetPasswordResponse, LoginRecoverPasswordHtmlContentData, LoginRecoverPasswordHtmlContentResponse, PrivateCreateUserData, PrivateCreateUserResponse, SecretsReadSecretsResponse, SecretsSaveSecretData, SecretsSaveSecretResponse, SecretsDeleteSecretData, SecretsDeleteSecretResponse, UsersReadUsersData, UsersReadUsersResponse, UsersCreateUserData, UsersCreateUserResponse, UsersReadUserMeResponse, UsersDeleteUserMeResponse, UsersUpdateUserMeData, UsersUpdateUserMeResponse, UsersUpdatePasswordMeData, UsersUpdatePasswordMeResponse, UsersRegisterUserData, UsersRegisterUserResponse, UsersReadUserByIdData, UsersReadUserByIdResponse, UsersUpdateUserData, UsersUpdateUserResponse, UsersDeleteUserData, UsersDeleteUserResponse, UtilsTestEmailData, UtilsTestEmailResponse, UtilsHealthCheckResponse } from './types.gen';
 
 export class FlowsService {
     /**
@@ -240,117 +240,6 @@ export class FlowsService {
     }
 }
 
-export class ItemsService {
-    /**
-     * Read Items
-     * Retrieve items.
-     * @param data The data for the request.
-     * @param data.skip
-     * @param data.limit
-     * @returns ItemsPublic Successful Response
-     * @throws ApiError
-     */
-    public static readItems(data: ItemsReadItemsData = {}): CancelablePromise<ItemsReadItemsResponse> {
-        return __request(OpenAPI, {
-            method: 'GET',
-            url: '/api/v1/items/',
-            query: {
-                skip: data.skip,
-                limit: data.limit
-            },
-            errors: {
-                422: 'Validation Error'
-            }
-        });
-    }
-    
-    /**
-     * Create Item
-     * Create new item.
-     * @param data The data for the request.
-     * @param data.requestBody
-     * @returns ItemPublic Successful Response
-     * @throws ApiError
-     */
-    public static createItem(data: ItemsCreateItemData): CancelablePromise<ItemsCreateItemResponse> {
-        return __request(OpenAPI, {
-            method: 'POST',
-            url: '/api/v1/items/',
-            body: data.requestBody,
-            mediaType: 'application/json',
-            errors: {
-                422: 'Validation Error'
-            }
-        });
-    }
-    
-    /**
-     * Read Item
-     * Get item by ID.
-     * @param data The data for the request.
-     * @param data.id
-     * @returns ItemPublic Successful Response
-     * @throws ApiError
-     */
-    public static readItem(data: ItemsReadItemData): CancelablePromise<ItemsReadItemResponse> {
-        return __request(OpenAPI, {
-            method: 'GET',
-            url: '/api/v1/items/{id}',
-            path: {
-                id: data.id
-            },
-            errors: {
-                422: 'Validation Error'
-            }
-        });
-    }
-    
-    /**
-     * Update Item
-     * Update an item.
-     * @param data The data for the request.
-     * @param data.id
-     * @param data.requestBody
-     * @returns ItemPublic Successful Response
-     * @throws ApiError
-     */
-    public static updateItem(data: ItemsUpdateItemData): CancelablePromise<ItemsUpdateItemResponse> {
-        return __request(OpenAPI, {
-            method: 'PUT',
-            url: '/api/v1/items/{id}',
-            path: {
-                id: data.id
-            },
-            body: data.requestBody,
-            mediaType: 'application/json',
-            errors: {
-                422: 'Validation Error'
-            }
-        });
-    }
-    
-    /**
-     * Delete Item
-     * Delete an item.
-     * @param data The data for the request.
-     * @param data.id
-     * @returns Message Successful Response
-     * @throws ApiError
-     */
-    public static deleteItem(data: ItemsDeleteItemData): CancelablePromise<ItemsDeleteItemResponse> {
-        return __request(OpenAPI, {
-            method: 'DELETE',
-            url: '/api/v1/items/{id}',
-            path: {
-                id: data.id
-            },
-            errors: {
-                422: 'Validation Error'
-            }
-        });
-    }
-}
-
 export class LoginService {
     /**
      * Login Access Token