feat(scenario): run logs, lint/format tooling, CONTRIBUTING

- add ScenarioRunLogEntity to persist step script output to DB
- stepLogger dual-writes to NestJS logger and DB (fire-and-forget)
- add GET /scenarios/:id/run/:runId returning run, stepRuns and logs
- add POST /scenarios/:id/run/:runId/wait (polls until terminal state)
- 9 new integration tests for the two endpoints (136 total)
- add eslint with typescript-eslint and eslint-config-prettier
- add npm scripts: format, lint, lint:fix
- resolve all lint errors across src and test (no any types)
- add CONTRIBUTING.md covering dev workflow

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

@@ -1,8 +1,8 @@
-import { ApiPropertyOptional } from '@nestjs/swagger';
-import { IsOptional, IsString, IsNotEmpty } from 'class-validator';
+import { ApiPropertyOptional } from "@nestjs/swagger";
+import { IsOptional, IsString, IsNotEmpty } from "class-validator";
 
 export class UpdateScenarioDto {
-  @ApiPropertyOptional({ example: 'Updated scenario name' })
+  @ApiPropertyOptional({ example: "Updated scenario name" })
   @IsOptional()
   @IsString()
   @IsNotEmpty()