feat: implement an api endpoint to create a new license

[SRWieZ]

Adds a new API endpoint for external services to create licenses programmatically. The endpoint handles user
creation/lookup, license generation through Anystack, and tracks the license source for better analytics.

Usage

1. Generate an API Token

1. Login to the admin panel
2. Navigate to "API Keys" in the sidebar
3. Click "Create" and fill in:
   - Name: A descriptive name for your API key
   - User: Select the admin user
   - Abilities: Leave as * for full access
4. Copy the generated token immediately (it won't be shown again)

2. Create a License via API

  curl -X POST https://your-domain.com/api/licenses \
    -H "Authorization: Bearer YOUR_API_TOKEN" \
    -H "Content-Type: application/json" \
    -H "Accept: application/json" \
    -d '{
      "email": "customer@example.com",
      "name": "Customer Name",
      "subscription": "pro"
    }'

Available subscription types: mini, pro, max, forever, trial

3. Response

The API returns the created license object:

  {
    "id": 123,
    "user_id": 456,
    "policy_name": "pro",
    "source": "bifrost",
    "key": "LICENSE-KEY-HERE",
    "expires_at": null,
    "created_at": "2025-07-24T12:00:00Z",
    "updated_at": "2025-07-24T12:00:00Z"
  }

Notes

• If the email already exists, the existing user will be used
• New users are created with a random password
• All licenses created via this API are marked with source: "bifrost"
• The endpoint requires Anystack API credentials to be configured