feat: implement frontend video platform configuration and abstraction

- Add NEXT_PUBLIC_VIDEO_PLATFORM environment variable support
- Create video platform abstraction layer with factory pattern
- Implement Whereby and Jitsi platform providers
- Update room meeting page to use platform-agnostic component
- Add platform display in room management (cards and table views)
- Support single platform per deployment configuration
- Maintain backward compatibility with existing Whereby integration

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

www/app/lib/videoPlatforms/jitsi/JitsiProvider.tsx

@@ -0,0 +1,68 @@
+"use client";
+
+import {
+  useCallback,
+  useEffect,
+  useRef,
+  useState,
+  forwardRef,
+  useImperativeHandle,
+} from "react";
+import { VideoPlatformComponentProps } from "../types";
+
+const JitsiProvider = forwardRef<HTMLElement, VideoPlatformComponentProps>(
+  ({ meeting, roomRef, onReady, onConsentGiven, onConsentDeclined }, ref) => {
+    const [jitsiReady, setJitsiReady] = useState(false);
+    const internalRef = useRef<HTMLIFrameElement>(null);
+    const iframeRef =
+      (roomRef as React.RefObject<HTMLIFrameElement>) || internalRef;
+
+    // Expose the element ref through the forwarded ref
+    useImperativeHandle(ref, () => iframeRef.current!, [iframeRef]);
+
+    // Handle iframe load
+    const handleLoad = useCallback(() => {
+      setJitsiReady(true);
+      if (onReady) {
+        onReady();
+      }
+    }, [onReady]);
+
+    // Set up event listeners
+    useEffect(() => {
+      if (!iframeRef.current) return;
+
+      const iframe = iframeRef.current;
+      iframe.addEventListener("load", handleLoad);
+
+      return () => {
+        iframe.removeEventListener("load", handleLoad);
+      };
+    }, [handleLoad]);
+
+    if (!meeting) {
+      return null;
+    }
+
+    // For Jitsi, we use the room_url (user JWT) or host_room_url (moderator JWT)
+    const roomUrl = meeting.host_room_url || meeting.room_url;
+
+    return (
+      <iframe
+        ref={iframeRef}
+        src={roomUrl}
+        style={{
+          width: "100vw",
+          height: "100vh",
+          border: "none",
+        }}
+        allow="camera; microphone; fullscreen; display-capture; autoplay"
+        title="Jitsi Meet"
+      />
+    );
+  },
+);
+
+JitsiProvider.displayName = "JitsiProvider";
+
+export default JitsiProvider;