Add detection and error message for ulc.lua.txt files

[Copilot]

Users with hidden file extensions create ulc.lua.txt instead of ulc.lua, causing silent failures with generic error messages.

Changes

• Added ulc.lua.txt detection in LoadExternalVehicleConfig() after ulc.lua lookup fails

  • Checks both root and data/ subdirectory locations
  • Returns early with specific error message instructing user to rename file and enable extension visibility

• Fixed undefined variable bug at line 382 where resourceName was used instead of loop iterator v in resource loading status message

Behavior

When ulc.lua is missing but ulc.lua.txt exists:

-- Before: generic "Could not load external configuration" error
-- After: "Found 'ulc.lua.txt' file in resource: 'vehicle-pack'. You need to rename it to 'ulc.lua' (without the .txt extension). Make sure file extensions are visible in your file explorer."

Error message format matches existing TriggerEvent("ulc:error", ...) patterns in codebase.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add: Check for ulc.lua.txt to throw warning/error to user</issue_title>
<issue_description>Some people have extensions hidden in their explorers and keep creating files named ulc.lua.txt instead of ulc.lua we should check for this file and warn/error during resource start.</issue_description>

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

• Fixes Add: Check for ulc.lua.txt to throw warning/error to user #49

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