Rename module from dmdfs to dmdevfs

[Copilot]

The module name dmdfs lacked readability. Renamed to dmdevfs throughout the codebase.

Files renamed:

• src/dmdfs.c → src/dmdevfs.c
• include/dmdfs.h → include/dmdevfs.h

Code changes:

• Header guards: DMDFS_H → DMDEVFS_H
• Version macros: DMDFS_VERSION_* → DMDEVFS_VERSION_*
• Magic number: DMDFS_CONTEXT_MAGIC → DMDEVFS_CONTEXT_MAGIC (value: 0x444D4446 → 0x444D4456)
• DMFSI API declarations: all 19 function registrations updated from dmdfs to dmdevfs
• Function calls: dmfsi_dmdfs_context_is_valid() → dmfsi_dmdevfs_context_is_valid()
• Log prefixes: "dmdfs:" → "dmdevfs:"

Build configuration:

• CMakeLists.txt: project name, module name, source file references
• manifest.dmm: module name and release artifact patterns

Documentation:

• README.md: all references, code examples, project structure
• GitHub workflows: artifact names, job descriptions

Example usage change:

// Before
dmvfs_mount_fs("dmdfs", "/mnt", NULL);

// After
dmvfs_mount_fs("dmdevfs", "/mnt", NULL);

Repository URLs remain unchanged pending GitHub repository rename.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Zmienić nazwę modułu</issue_title>
<issue_description>Mało czytelna jest ta nazwa. Powinna być:
dmdevfs. Trzeba zmienić wszędzie w repo te nazwę - a ja na koniec zmienię ja w github</issue_description>

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

• Fixes Zmienić nazwę modułu #5

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