feat(scenario): add scenario and scenario step CRUD module

- add ScenarioEntity and ScenarioStepEntity with cascade delete
- step fields: type (login|exec), sessionName (required), execCode, validateCode
- login steps create a named session; exec steps consume it by sessionName
- full CRUD controller under /scenarios and /scenarios/:id/steps
- paginated GET /scenarios with page/limit query params returning { data, total, page, limit }
- register ScenarioModule and entities in AppModule

src/scenario/dto/create-scenario-step.dto.ts

@@ -0,0 +1,26 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsIn, IsNotEmpty, IsOptional, IsString } from 'class-validator';
+import { StepType } from '../scenario-step.entity';
+
+export class CreateScenarioStepDto {
+  @ApiProperty({ enum: ['login', 'exec'], example: 'exec' })
+  @IsIn(['login', 'exec'])
+  type: StepType;
+
+  @ApiProperty({ description: 'Session name used by this step. login steps create it; exec steps consume it.', example: 'my-session' })
+  @IsString()
+  @IsNotEmpty()
+  sessionName: string;
+
+  @ApiPropertyOptional({ example: 'return await page.title();' })
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  execCode?: string;
+
+  @ApiPropertyOptional({ example: 'return { success: result !== null, description: "title present" };' })
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  validateCode?: string;
+}

src/scenario/dto/create-scenario.dto.ts

@@ -0,0 +1,9 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { IsNotEmpty, IsString } from 'class-validator';
+
+export class CreateScenarioDto {
+  @ApiProperty({ example: 'Login and verify cabinet' })
+  @IsString()
+  @IsNotEmpty()
+  name: string;
+}

src/scenario/dto/pagination-query.dto.ts

@@ -0,0 +1,19 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { Type } from 'class-transformer';
+import { IsInt, IsOptional, Min } from 'class-validator';
+
+export class PaginationQueryDto {
+  @ApiPropertyOptional({ example: 1, default: 1 })
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  page?: number = 1;
+
+  @ApiPropertyOptional({ example: 20, default: 20 })
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  limit?: number = 20;
+}

src/scenario/dto/update-scenario-step.dto.ts

@@ -0,0 +1,28 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsIn, IsNotEmpty, IsOptional, IsString } from 'class-validator';
+import { StepType } from '../scenario-step.entity';
+
+export class UpdateScenarioStepDto {
+  @ApiPropertyOptional({ enum: ['login', 'exec'] })
+  @IsOptional()
+  @IsIn(['login', 'exec'])
+  type?: StepType;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  sessionName?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  execCode?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  validateCode?: string;
+}

src/scenario/dto/update-scenario.dto.ts

@@ -0,0 +1,10 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsOptional, IsString, IsNotEmpty } from 'class-validator';
+
+export class UpdateScenarioDto {
+  @ApiPropertyOptional({ example: 'Updated scenario name' })
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  name?: string;
+}