fix(simu): force C locale for numeric parsing in simulator

[bultodepapas]

Fixes #7453

Summary

The Companion / SDL simulator failed to run when the host locale is not C/English (e.g. LANG=es_ES.UTF-8): all float numbers parsed by the Lua engine produced errors because strtof/strtod use the locale's decimal separator (, in es_ES) instead of ..

Fix

Force LC_NUMERIC to "C" in simuInit() (radio/src/targets/simu/simulib.cpp), which is the shared entry point for both the SDL and the WASM simulator. This makes numeric conversions locale-independent inside the simulator while leaving the rest of the process untouched.

Verification

Compiled a small host test that calls setlocale(LC_NUMERIC, "C") and confirmed strtod("1.5") parses correctly regardless of the host locale.

[Copilot]

Pull request overview

This PR fixes simulator failures under non-C host locales by forcing locale-independent numeric parsing (so Lua number parsing via strtof/strtod continues to expect . as the decimal separator). The change is applied in simuInit(), the shared simulator entry point used by SDL, tests, and the WASM host.

Changes:

• Force LC_NUMERIC to "C" during simulator initialization to prevent locale-dependent float parsing.
• Add the required locale header include (<clocale>) for setlocale.

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