chore(api): enable request timeout

[jakubno]

Reverts #2156

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Note

Medium Risk
Enabling a hard 60s request context deadline can cause previously-long requests to start failing with 408s and may surface cancellation-related bugs in downstream calls that weren’t context-aware.

Overview
Re-enables a global 60s per-request context timeout in the API by defining requestTimeout and wiring customMiddleware.RequestTimeout into the Gin middleware chain, so handlers and blocking upstream calls are canceled on deadline and requests can return 408 Request Timeout when no response was written.

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