Add dmosi SAL implementation for Dmod_GetUptime

[Copilot]

Dmod_GetUptime was added to the DMOD SAL but lacked an implementation in dmosi. The dmosi layer is the natural place to wire it up via the existing tick-count API.

Changes

• src/dmosi.c — New "DMOD Time API Implementation" section implementing Dmod_GetUptime by delegating to dmosi_get_tick_count(), cast to Dmod_Timestamp_t (uint64_t). Assumes standard 1 ms/tick RTOS configuration.

• CMakeLists.txt — Adds DMOSI_DONT_IMPLEMENT_DMOD_API_TIME opt-out flag, consistent with the existing per-subsystem guard pattern (MUTEX, ENV, PROC).

Dmod_Timestamp_t Dmod_GetUptime(void)
{
    return (Dmod_Timestamp_t)dmosi_get_tick_count();
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Dodać implementację SAL API Dmod_GetUptime</issue_title>
<issue_description>DMOD został ostatnio wzbogacony o funkcję Dmod_GetUptime - dodajmy naszą implementację, która będzie domyślnie używać API pobierania ticków</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Dodać implementację SAL API Dmod_GetUptime #25

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