Fix failing input tests and add Dmod_Stdin_SetFlags/GetFlags support

[Copilot]

Input API tests were timing out due to dmlog_input_available() only checking the ring buffer, not the internal read buffer. When multiple chars were read at once, data moved to internal buffer but input_available returned false, causing infinite wait loops.

Changes

• Fix dmlog_input_available(): Check both ring buffer and internal read buffer

  result = (ctx->ring.input_tail_offset != ctx->ring.input_head_offset) ||
           (ctx->input_read_entry_offset < DMOD_LOG_MAX_ENTRY_SIZE && 
            ctx->input_read_buffer[ctx->input_read_entry_offset] != '\0');

• Implement Dmod_Stdin_SetFlags/Dmod_Stdin_GetFlags: Store flags in dmlog format internally, convert in get/set functions

  • DMOD_STDIN_FLAG_ECHO ↔ !DMLOG_INPUT_REQUEST_FLAG_ECHO_OFF
  • DMOD_STDIN_FLAG_CANONICAL ↔ DMLOG_INPUT_REQUEST_FLAG_LINE_MODE

• Simplify Dmod_Getc/Dmod_Gets: Use global flags directly without per-call conversion

• Set CI test timeout: 10 minutes (was defaulting to 6h)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Naprawić failujace testy i dodać wsparcie dla flag stdin</issue_title>
<issue_description>Aktualnie testy z input failuja z timeoutem. Niestety domyślny timeout jest ustawiony na CI na 6h - ustaw go na 10 minut.

Napraw failujace testy i dodaj wsparcie dla nowych funkcji z dmod - Dmod_Stdin_SetFlags i Dmod_Stdin_GetFlags - niech one ustawiają jakaś zmienna globalna, której będziesz używać w dmod API dla getc i gets. </issue_description>

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

• Fixes Naprawić failujace testy i dodać wsparcie dla flag stdin #48

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