Generate unique ticket ID for each ticket

[Ericthilen]

Implement a unique and human-readable ticket ID that is automatically generated when a new ticket is created.
The ID should be stored in the database and returned in API responses.
It must be possible to search for tickets using this ID.

[Requirements]

• Generate ID when creating a ticket
• ID must be unique
• Store ID in Ticket entity
• Include ID in TicketResponseDTO
• ID should be human-friendly (not just database ID)

[Example format]

• TICKET-1001

[Acceptance Criteria]

• Ticket ID is generated automatically
• Ticket ID is unique
• Ticket ID is stored in database
• Ticket ID is returned in API response
• No duplicate IDs exist

[coderabbitai]

🔗 Related PRs

#23 - Feature/ticket entity life cycle [merged]

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