[Concurrency] TICKETS_DB list lacks thread safety for concurrent create/update

[sanrishi]

Target

\�ackend/routers/tickets.py: \create_ticket, \update_ticket
\�ackend/ticket_store.py\ (new)

Vector

Thread Pool Exhaustion / Concurrency

Problem

\TICKETS_DB\ was a bare Python list with unsafe iteration and mutation. Concurrent requests could bypass duplicate checks and corrupt data.

Changes

• Created \TicketStore\ with \ hreading.RLock\ for atomic operations
• \create_ticket\ uses \ icket_store.add()\
• \update_ticket\ uses \ icket_store.update()\

Fixes #2870

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