feat(support-tickets): Implement support tickets module

[BigBen-7]

Pull Request (PR) Description

Closes #390

📝 Description

This pull request introduces a new standalone SupportTicketsModule to allow users and staff to create, manage, and track support and maintenance tickets.

Key Features

• CRUD Endpoints: Adds full CRUD functionality at /support-tickets.
• Entity: Introduces the SupportTicket entity with relationships to User (creator) and Staff (assignee).
• Status Tracking: Tickets have a status (open, in_progress, resolved) managed via an enum.
• Assignment: Staff members can be assigned to tickets via the PATCH endpoint.

Implementation Details

• Module: SupportTicketsModule
• Controller: SupportTicketsController
• Service: SupportTicketsService
• Entity: SupportTicket (in src/support-tickets/entities/)
• DTOs: CreateSupportTicketDto, UpdateSupportTicketDto
• Enum: TicketStatus

Future Considerations / TODO

• Implement fine-grained authorization (e.g., only staff can assign tickets, only admins/creators can delete).
• Add email notifications when a ticket status changes or is assigned.

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