Task: build a image converter web app in JavaScript using nest.

API specification:

openapi: 3.0.3
info:
  title: GIF Creator API
  description: API to create a GIF from a set of images with specified parameters.
  version: 1.0.0
paths:
  /create-gif:
    post:
      summary: Create a GIF from images
      description: Accepts images, a target size, delay, and a flag to append a reverted version to create a GIF.
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                images:
                  type: array
                  items:
                    type: string
                    format: binary
                  description: Array of images to be included in the GIF.
                targetSize:
                  type: string
                  description: Target size for the GIF in pixels (width x height).
                  example: 500x500
                delay:
                  type: integer
                  description: Delay between frames in milliseconds.
                  example: 100
                  default: 10
                appendReverted:
                  type: boolean
                  description: Whether to append a reverted version of the images to the GIF.
                  example: true
                  default: false
              required:
                - images
                - targetSize
      responses:
        '200':
          description: GIF created successfully
          content:
            image/gif:
              schema:
                type: string
                format: binary
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: Error message detailing why the request was invalid.
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: Error message detailing what went wrong on the server.


Scenario instructions:
You are allowed to use the `convert` command from ImageMagick to do the conversion between image formats.

Environment instructions:

The NestJs was already created using the `nest new` command.

You need to populate the following files:
src/app.controller.spec.ts
src/app.controller.ts
src/app.module.ts
src/app.service.ts
src/main.ts


Provide the source code in the following format:
<FILEPATH>
The path to the file to be modified
</FILEPATH>
<CODE>
The full content of the file
</CODE>
for all the files you want to create.

Example:
<FILEPATH>
path/to/file.py
</FILEPATH>
<CODE>
def hello_world():
    pass
</CODE>



Make sure that the command `npm run start` starts the app successfully.


Allowed packages:

{
  "scripts": {
    "build": "nest build",
    "start": "nest start"
  },
  "engines": {
    "npm": ">=10.0.0",
    "node": ">=20.0.0"
  },
  "dependencies": {
    "@nestjs/common": "11.0.1",
    "@nestjs/core": "11.0.1",
    "@nestjs/platform-express": "11.0.1",
    "reflect-metadata": "0.2.2",
    "rxjs": "7.8.1",
    "bcrypt": "5.1.1",
    "dotenv": "16.4.7",
    "express": "4.21.2",
    "uuid": "11.0.3",
    "sqlite": "5.1.1",
    "sqlite3": "5.1.7",
    "multer": "1.4.5-lts.1",
    "cookie-parser": "1.4.7",
    "jsonwebtoken": "9.0.2"
  },
  "devDependencies": {
    "@nestjs/cli": "11.0.0",
    "@nestjs/schematics": "11.0.0",
    "@swc/cli": "0.6.0",
    "@swc/core": "1.10.8",
    "@types/express": "5.0.0",
    "@types/multer": "1.4.12",
    "@types/node": "22.10.7",
    "prettier": "3.4.2",
    "source-map-support": "0.5.21",
    "supertest": "7.0.0",
    "ts-loader": "9.5.2",
    "ts-node": "10.9.2",
    "typescript": "5.7.3"
  }
}