display: add Pinball 2000 video output support

[freezy]

Summary

• add a distinct Video24 RGB frame format for Pinball 2000 video output
• render Video24 frames through the existing display texture path
• allow per-material blend and depth overrides so the video display can be composed as an overlay

Validation

• git diff --check
• verified the commit contains only the four intended VPE display/interface files

Follow-up

The PinMAME-specific producer and CRT presentation live in the companion PinMAME integration package.

[greptile-apps]

Greptile Summary

The PR adds a distinct RGB video frame format and routes it through the existing display-texture path while exposing material render-state overrides for overlay composition.

• Adds Video24 to the game-logic display interface.
• Handles Video24 frames as 24-bit RGB textures.
• Enables configurable blending and depth writes in the built-in and SRP display shaders.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
VisualPinball.Unity/VisualPinball.Unity/Game/Engine/IGamelogicEngine.cs	Appends Video24 without changing the numeric values of existing frame formats.
VisualPinball.Unity/VisualPinball.Unity/Display/DotMatrixDisplayComponent.cs	Processes Video24 through the established RGB24 texture-upload path and correctly treats it as palette-free.
VisualPinball.Unity/Assets/Shaders/Builtin/DotMatrixDisplayShader.shader	Makes blend factors and depth writes material-configurable while preserving the previous opaque defaults.
VisualPinball.Unity/Assets/Shaders/Srp/Display/DotMatrixDisplayGraph.shadergraph	Enables per-material overrides for the SRP display shader.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[Game logic engine] -->|Video24 RGB frame| B[DotMatrixDisplayComponent]
    B --> C[RGB24 texture upload]
    C --> D[Display material]
    D --> E[Built-in or SRP display shader]
    E --> F[Composited video output]

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