Add Scenario Mode with workflow editor - backend and frontend implementation

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

back/data/scenario.ts

@@ -0,0 +1,89 @@
+import { sequelize } from '.';
+import { DataTypes, Model } from 'sequelize';
+
+interface WorkflowNode {
+  id: string;
+  type: 'http' | 'script' | 'condition' | 'delay' | 'loop';
+  label: string;
+  x?: number;
+  y?: number;
+  config: {
+    // HTTP Request node
+    url?: string;
+    method?: 'GET' | 'POST' | 'PUT' | 'DELETE';
+    headers?: Record<string, string>;
+    body?: string;
+    
+    // Script node
+    scriptId?: number;
+    scriptPath?: string;
+    scriptContent?: string;
+    
+    // Condition node
+    condition?: string;
+    trueNext?: string;
+    falseNext?: string;
+    
+    // Delay node
+    delayMs?: number;
+    
+    // Loop node
+    iterations?: number;
+    loopBody?: string[];
+  };
+  next?: string | string[]; // ID(s) of next node(s)
+}
+
+interface WorkflowGraph {
+  nodes: WorkflowNode[];
+  startNode?: string;
+}
+
+export class Scenario {
+  name?: string;
+  description?: string;
+  id?: number;
+  status?: 0 | 1; // 0: disabled, 1: enabled
+  workflowGraph?: WorkflowGraph;
+  createdAt?: Date;
+  updatedAt?: Date;
+
+  constructor(options: Scenario) {
+    this.name = options.name;
+    this.description = options.description;
+    this.id = options.id;
+    this.status = options.status || 0;
+    this.workflowGraph = options.workflowGraph;
+    this.createdAt = options.createdAt;
+    this.updatedAt = options.updatedAt;
+  }
+}
+
+export interface ScenarioInstance
+  extends Model<Scenario, Scenario>,
+    Scenario {}
+
+export const ScenarioModel = sequelize.define<ScenarioInstance>(
+  'Scenario',
+  {
+    name: {
+      type: DataTypes.STRING,
+      allowNull: false,
+    },
+    description: {
+      type: DataTypes.TEXT,
+      allowNull: true,
+    },
+    status: {
+      type: DataTypes.INTEGER,
+      defaultValue: 0,
+    },
+    workflowGraph: {
+      type: DataTypes.JSON,
+      allowNull: true,
+    },
+  },
+  {
+    timestamps: true,
+  },
+);