Add DMOD_MODULE mode support to dmosi

[Copilot]

dmosi was only usable in DMOD_SYSTEM mode. Modules needing OS interface access had no way to link against dmosi without pulling in the full system-mode implementation. This follows the pattern established in dmlist.

CMakeLists.txt

• Include ${DMOD_DIR}/paths.cmake to resolve DMOD_SYSTEM/DMOD_MODULE booleans
• Add dmosi_if INTERFACE library exposing only the include directory — linkable by modules in any build mode
• Guard the dmosi STATIC library (implementation, compile definitions, coverage, makefile generation) under if(DMOD_SYSTEM)

add_library(dmosi_if INTERFACE)
target_include_directories(dmosi_if INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include)

if(DMOD_SYSTEM)
    add_library(dmosi STATIC src/dmosi.c)
    # ... full implementation targets
endif()

CI Workflow

• Add a DMOD_MODULE mode build leg (-DDMOD_MODE=DMOD_MODULE) that verifies libdmosi.a is not produced (only the interface target is built in module mode)

Original prompt

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This section details on the original issue you should resolve

<issue_title>dostosować interfejs do użytkowania w modułach</issue_title>
<issue_description>Aktualnie interfejs jest przystosowany tylko do wykorzystania w trybie DMOD_SYSTEM - trzeba go jeszcze przygotować do użycia w trybie DMOD_MODULE tak jak to zostało zrobione w dmlist:

https://github.com/choco-technologies/dmlist</issue_description>

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

• Fixes dostosować interfejs do użytkowania w modułach #29

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