Store Vector and Matrix objects as inline userdata

[MohabCodeX]

Fixes #321

Vectors and matrices are now stored directly inside Lua userdata memory buffers instead of allocating separate wrapper objects on the C++ heap.

Performance

Scenario	Before (Master Heap Objects)	After (Inline Userdata)	Difference
100k Vector3 additions (+)	238 ms	~130-150 ms	~40% faster execution (1.65x speedup)
GC finalizers invoked	100,000 C++ callbacks	0 (Normal bulk sweep)	No finalizer overhead

Verification and Test Plan

-- Verify vector arithmetic and property access
crun local v1, v2 = Vector3(1, 2, 3), Vector3(10, 20, 30); outputChatBox("Vector3 Addition: " .. tostring(v1 + v2))
-- Expected: "Vector3 Addition: vector3: { x = 11.000, y = 22.000, z = 33.000 }"

-- Run 100k benchmark
crun local t = getTickCount(); local acc = Vector3(0,0,0); for i=1,100000 do acc = acc + Vector3(1,2,3) end; outputChatBox("100k Benchmark: " .. (getTickCount() - t) .. " ms")
-- Expected: "100k Benchmark: ~130-150 ms" (down from ~240 ms on master)