Bug: Slack Workspace model fails during Django initialization

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## **Describe the bug**

Running the Django system check fails due to a model initialization issue in the Slack module. The error occurs because the `Workspace` model is imported before Django finishes registering applications.

---

## **To Reproduce**

Steps to reproduce the behavior:

1. Clone the repository
2. Install dependencies using Poetry
3. Set required environment variables
4. Run:

```
poetry run python manage.py check
```

5. Observe the error during Django initialization

---

## **Expected behavior**

Django should initialize successfully and `manage.py check` should complete without errors when all apps are correctly configured.

---

## **Are you going to work on fixing this?**

* [x] Yes
* [ ] No

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## **Screenshots**

Attach:

## **Desktop (please complete the following information):**

* OS: Windows 11
* Browser: N/A
* Version: N/A

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## **Smartphone (please complete the following information):**

* Device: N/A
* OS: N/A
* Browser: N/A
* Version: N/A

---

## **Additional context**

The issue is caused by early import of Slack models inside admin modules.

File:

```
apps/owasp/admin/mixins.py
```

Problematic import:

```python
from apps.slack.models.conversation import Conversation
```

This triggers model loading during Django admin autodiscovery, before the application registry is fully initialized, leading to:

```
RuntimeError: Model class apps.slack.models.workspace.Workspace
doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.
```

Suggested fix:
Move the import inside functions or methods to delay model loading until after Django initialization.

Example:

```python
def get_conversation_model():
from apps.slack.models.conversation import Conversation
return Conversation
```

This avoids premature model import and resolves the issue.