PAYMENT_REQUEST_TIMEOUT_SECONDS was read once in each provider's
__init__ and baked into the aiohttp session, so admin overrides
(applied in-process) only took effect after a container restart.
Providers now hand HttpClientMixin a timeout source callable; the
mixin builds the session with the current value and swaps in a fresh
session when the value changes, closing the replaced one only after
any in-flight request on it is bound by its own total timeout.
Also:
- check the Heleket payment-info success flag before reading the
payload so a non-dict provider response cannot raise in the
pending-payment reuse path
- add PAYMENT_REQUEST_TIMEOUT_SECONDS to the FreeKassa settings stub
in test_security.py (fixes three tests broken by the new field)
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