fix(ecs): guard against capacity overflow in ComponentReflectionRegistry::Register

[jnyfah]

Summary

• Adds a ZENGINE_VALIDATE_ASSERT before m_meta.push(meta) in ComponentReflectionRegistry::Register to catch capacity overflows at the call site.
• Without this guard, pushing beyond the reserved capacity would silently overflow or trigger an assertion deeper inside the push implementation, making the root cause harder to diagnose.

Changes

• ComponentReflectionRegistry.cpp: capacity check assert added before m_meta.push(meta)

Test plan

• Register components up to and beyond the reserved capacity and confirm the assert fires with a clear message.
• Confirm no regression in normal component registration paths.