refactor: split monolith into 3 microservices (frontend, backend, discord-gateway)

- Extract services into services/{frontend,backend,discord-gateway}
- Create packages/shared/ for shared logger, errors, utils, types
- Setup Modular MVC pattern in backend (controller→service→repository)
- Setup event-driven architecture in discord-gateway with Redis pub/sub
- Move Docker files to infra/docker/ with per-service Dockerfiles
- Update docker-compose.yml to use Traefik-only routing (no port exposes)
- Update GitHub Actions deploy workflow for multi-service matrix build
- Fix all import paths and resolve type errors across all services
- All 3 services pass tsc --noEmit clean

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/frontend/src/features/live/components/ActiveSpeakers.tsx

@@ -0,0 +1,60 @@
+import type { ActiveSpeaker } from "../../../shared/api/client";
+import { Skeleton } from "../../../shared/ui";
+
+interface ActiveSpeakersProps {
+  speakers: ActiveSpeaker[];
+}
+
+export function ActiveSpeakers({ speakers }: ActiveSpeakersProps) {
+  if (speakers.length === 0) {
+    return (
+      <div className="rounded-xl border border-dashed border-border p-6 text-center text-sm text-muted-foreground">
+        No active speakers.
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-2">
+      {speakers.map((s) => {
+        // BUG 4 FIX: stable key — no index fallback
+        const key = s.userId ?? s.id ?? `speaker-${s.username}`;
+        return (
+          <div
+            key={key}
+            className="flex items-center gap-3 rounded-xl border border-border bg-background/60 p-3"
+          >
+            <img
+              src={s.avatar}
+              alt=""
+              className="h-8 w-8 rounded-full object-cover"
+            />
+            <div className="min-w-0">
+              <div className="truncate text-sm font-medium">{s.username}</div>
+              <div className="text-xs text-emerald-300">Speaking</div>
+            </div>
+          </div>
+        );
+      })}
+    </div>
+  );
+}
+
+export function ActiveSpeakersSkeleton() {
+  return (
+    <div className="space-y-2">
+      {[1, 2, 3].map((i) => (
+        <div
+          key={i}
+          className="flex items-center gap-3 rounded-xl border border-border bg-background/60 p-3"
+        >
+          <Skeleton className="h-8 w-8 rounded-full" />
+          <div className="flex-1 space-y-1">
+            <Skeleton className="h-4 w-24" />
+            <Skeleton className="h-3 w-16" />
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}