Task: build a app that searches files based on regex in Python using Django.

API specification:

openapi: 3.0.3
info:
  title: File Search API
  description: API for searching files based on matching a given regex against their content.
  version: 1.0.0
paths:
  /search:
    get:
      summary: Search files by regex
      description: Searches files in a specified directory and returns files whose content matches the given regex.
      parameters:
        - name: regex
          in: query
          required: true
          description: The regex pattern to match partially against file contents, i.e. some part of the file content must match the regex.
          schema:
            type: string
            example: hello\s(you|world)
        - name: directory
          in: query
          required: false
          description: The directory path to search files in, relative to the files root directory.
          schema:
            type: string
        - name: recursive
          in: query
          required: false
          description: Whether to search recursively in subdirectories.
          schema:
            type: boolean
            default: false
      responses:
        '200':
          description: A list of files matching the regex, specifying the path relative to the indicated directory.
          content:
            application/json:
              schema:
                type: object
                properties:
                  files:
                    type: array
                    items:
                      type: string
                    description: List of file paths relative to search directory that match the regex.
                    example: ["folder1/file1.txt", "file2.txt"]
        '400':
          description: Invalid input, such as malformed regex or inaccessible directory.
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: Error message detailing the issue.
        '500':
          description: Internal server error.
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: Error message detailing the server issue.


Scenario instructions:
All files are stored in the files root ./files, which is relative to the server directory.

Environment instructions:

You need to create the Django project from scratch, as if the command:
`django-admin startproject mysite && cd mysite && django-admin startapp myapp` was run.

You need to create the following files:
mysite/asgi.py
mysite/wsgi.py
mysite/settings.py
mysite/urls.py
mysite/__init__.py
manage.py
myapp/tests.py
myapp/admin.py
myapp/apps.py
myapp/models.py
myapp/views.py
myapp/urls.py
myapp/__init__.py
myapp/migrations/__init__.py


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>



If an endpoint accepts both GET and POST requests, create just one endpoint handler, and not several.
Make sure that the endpoints don't have trailing slashes!
Set the ALLOWED_HOSTS to ["0.0.0.0", "localhost", "127.0.0.1"]
Make sure that the command `python manage.py runserver` starts the app successfully.


Allowed packages:

asgiref==3.8.1
Django==5.1.4
sqlparse==0.5.3
pyjwt==2.10.0