Add identifier string for DMX realtime mode

[kilrah]

Fix #5509

Rebased on main, replaces #5511

[coderabbitai]

Walkthrough

Added a missing switch case in serializeInfo() to map REALTIME_MODE_DMX to the string representation "DMX" in the serialized JSON output, addressing the display of undefined mode for DMX input.

Changes

Cohort / File(s)	Summary
DMX Mode Serialization wled00/json.cpp	Added switch case mapping REALTIME_MODE_DMX to root["lm"] = "DMX" in serializeInfo() function to properly serialize DMX input mode.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding an identifier string for DMX realtime mode in the code.
Linked Issues check	✅ Passed	The PR directly addresses issue #5509 by adding the missing DMX identifier string mapping, which resolves the 'undefined' display issue on the live data overlay.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to adding a single case statement for DMX mode mapping in serializeInfo, directly addressing the linked issue with no extraneous modifications.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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