fix: Debug console renders on top of Draw nodes - fixes #2999

[ipezygj]

Summary

Fix debug console being hidden behind Draw node features by ensuring it registers render callback after all other 2D rendering callbacks.

Problem

When using the debug console with Draw nodes (DrawImageNode, DrawRectNode, etc.), the console UI is hidden behind the drawn content, making it inaccessible.

Root Cause

Both the debug console and Draw nodes use iron.App.notifyOnRender2D() to register 2D rendering callbacks. These are rendered in the order they're registered (as an array):

1. Draw nodes register first during scene initialization
2. Debug console registers second
3. Render loop executes in array order: Draw nodes render, then console renders on top
4. But Draw nodes ALSO render after console is set up, pushing themselves back to the end

Result: console ends up in the middle of the render order, appearing behind Draw nodes.

Solution

Use Scheduler.addFrameTask() to defer the debug console's render2D registration by one frame. This ensures the console callback is added LAST to the render array, guaranteeing it renders after all other 2D content.

// Before
notifyOnRender2D(render2D);

// After
Scheduler.addFrameTask(function() {
    notifyOnRender2D(render2D);
}, 0);

Benefits:

• Simple one-line fix (no refactoring)
• No performance impact (single frame deferred)
• Works with any number of Draw nodes
• Backward compatible

Testing

1. Create Armory scene with Draw Image node
2. Run scene and enable debug console (backtick key)
3. Verify console UI is visible ON TOP of drawn image
4. Toggle console visibility multiple times
5. Console should always be accessible and not hidden

Files Changed

• armory/Sources/armory/trait/internal/DebugConsole.hx - Defer render registration

Fixes #2999