fix(client): prevent native crash in RaycastCamera

[NebelRebell]

Adds proper entity validation to prevent native crashes caused by invalid entity handles.

• Validates entityHit against 0 and -1
• Uses DoesEntityExist before native calls
• Fixes parameter order in HasEntityClearLosToEntity
• Adds safe fallback for entityType == 0

Tested and verified on FiveM game build 2944.

This PR fixes native crashes triggered by invalid entity handles returned from GetShapeTestResult, which could lead to:

SCRIPT ERROR: Error executing native 0x8acd366038d14505
SCRIPT ERROR: Error executing native 0xfcdff7b72d23a1ac

The issue was caused by Lua treating 0 as truthy, allowing invalid entity handles to reach native calls.

• Have you personally loaded this code into an updated qbcore project and checked all it's functionality? Yes
• Does your code fit the style guidelines? Yes
• Does your PR fit the contribution guidelines? Yes

[ThatMadCap]

Are we going to have to start reviewing AI PRs now?

This is a bit of a mess. The comment choices need a lot of work.

I won't comment on the AI code because I'm not going to read it.

[Qwerty1Verified]

This doesn't fit the coding style guide, and similar to what MadCap said, I'd rather us not have to review AI code.