feat: Controller support, performance enchancements, multi-stage images, fixes (#304)

## Description
Oops.. another massive PR 🥲 

This PR contains multiple improvements and changes.

Firstly, thanks gst-wayland-display's PR
[here](https://github.com/games-on-whales/gst-wayland-display/pull/20).
NVIDIA path is now way more efficient than before.

Secondly, adding controller support was a massive hurdle, requiring me
to start another project
[vimputti](https://github.com/DatCaptainHorse/vimputti) - which allows
simple virtual controller inputs in isolated containers. Well, it's not
simple, it includes LD_PRELOAD shims and other craziness, but the
library API is simple to use..

Thirdly, split runner image into 3 separate stages, base + build +
runtime, should help keep things in check in future, also added GitHub
Actions CI builds for v2 to v4 builds (hopefully they pass..).

Fourth, replaced the runner's runtime Steam patching with better and
simpler bubblewrap patch, massive thanks to `games-on-whales` to
figuring it out better!

Fifth, relay for once needed some changes, the new changes are still
mostly WIP, but I'll deal with them next time I have energy.. I'm spent
now. Needed to include these changes as relay needed a minor change to
allow rumble events to flow back to client peer.

Sixth.. tons of package updates, minor code improvements and the usual. 

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* End-to-end gamepad/controller support (attach/detach, buttons, sticks,
triggers, rumble) with client/server integration and virtual controller
plumbing.
  * Optional Prometheus metrics endpoint and WebTransport support.
  * Background vimputti manager process added for controller handling.

* **Improvements**
  * Multi-variant container image builds and streamlined runtime images.
  * Zero-copy video pipeline and encoder improvements for lower latency.
  * Updated Steam compat mapping and dependency/toolchain refreshes.

* **Bug Fixes**
* More robust GPU detection, input/fullscreen lifecycle,
startup/entrypoint, and container runtime fixes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: DatCaptainHorse <DatCaptainHorse@users.noreply.github.com>

packages/input/src/webrtc-stream.ts

@@ -5,6 +5,7 @@ import {
   SafeStream,
 } from "./messages";
 import { webSockets } from "@libp2p/websockets";
+import { webTransport } from "@libp2p/webtransport";
 import { createLibp2p, Libp2p } from "libp2p";
 import { noise } from "@chainsafe/libp2p-noise";
 import { yamux } from "@chainsafe/libp2p-yamux";
@@ -13,9 +14,6 @@ import { multiaddr } from "@multiformats/multiaddr";
 import { Connection } from "@libp2p/interface";
 import { ping } from "@libp2p/ping";
 
-//FIXME: Sometimes the room will wait to say offline, then appear to be online after retrying :D
-// This works for me, with my trashy internet, does it work for you as well?
-
 const NESTRI_PROTOCOL_STREAM_REQUEST = "/nestri-relay/stream-request/1.0.0";
 
 export class WebRTCStream {
@@ -30,8 +28,9 @@ export class WebRTCStream {
   private _connectionTimer: NodeJS.Timeout | NodeJS.Timer | undefined = undefined;
   private _serverURL: string | undefined = undefined;
   private _roomName: string | undefined = undefined;
-  private _isConnected: boolean = false; // Add flag to track connection state
-  currentFrameRate: number = 60;
+  private _isConnected: boolean = false;
+  private _dataChannelCallbacks: Array<(data: any) => void> = [];
+  currentFrameRate: number = 100;
 
   constructor(
     serverURL: string,
@@ -59,7 +58,7 @@ export class WebRTCStream {
     console.log("Setting up libp2p");
 
     this._p2p = await createLibp2p({
-      transports: [webSockets()],
+      transports: [webSockets(), webTransport()],
       connectionEncrypters: [noise()],
       streamMuxers: [yamux()],
       connectionGater: {
@@ -219,7 +218,8 @@ export class WebRTCStream {
   }
 
   private _checkConnectionState() {
-    if (!this._pc) return;
+    if (!this._pc || !this._p2p || !this._p2pConn)
+      return;
 
     console.debug("Checking connection state:", {
       connectionState: this._pc.connectionState,
@@ -267,9 +267,9 @@ export class WebRTCStream {
       this._pc.connectionState === "closed" ||
       this._pc.iceConnectionState === "failed"
     ) {
-      console.log("Connection failed or closed, attempting reconnect");
-      this._isConnected = false; // Reset connected state
-      this._handleConnectionFailure();
+      console.log("PeerConnection failed or closed");
+      //this._isConnected = false; // Reset connected state
+      //this._handleConnectionFailure();
     }
   }
 
@@ -318,6 +318,7 @@ export class WebRTCStream {
         console.error("Error closing data channel:", err);
       }
       this._dataChannel = undefined;
+      this._dataChannelCallbacks = [];
     }
     this._isConnected = false; // Reset connected state during cleanup
   }
@@ -329,15 +330,31 @@ export class WebRTCStream {
     }
   }
 
+  public addDataChannelCallback(callback: (data: any) => void) {
+    this._dataChannelCallbacks.push(callback);
+  }
+
+  public removeDataChannelCallback(callback: (data: any) => void) {
+    this._dataChannelCallbacks = this._dataChannelCallbacks.filter(cb => cb !== callback);
+  }
+
   private _setupDataChannelEvents() {
     if (!this._dataChannel) return;
 
     this._dataChannel.onclose = () => console.log("sendChannel has closed");
     this._dataChannel.onopen = () => console.log("sendChannel has opened");
-    this._dataChannel.onmessage = (e) =>
-      console.log(
-        `Message from DataChannel '${this._dataChannel?.label}' payload '${e.data}'`,
-      );
+    this._dataChannel.onmessage = (event => {
+      // Parse as ProtoBuf message
+      const data = event.data;
+      // Call registered callback if exists
+      this._dataChannelCallbacks.forEach((callback) => {
+        try {
+          callback(data);
+        } catch (err) {
+          console.error("Error in data channel callback:", err);
+        }
+      });
+    });
   }
 
   private _gatherFrameRate() {