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/shared/ui/card.tsx

@@ -0,0 +1,66 @@
+import type * as React from "react";
+import { cn } from "../lib/utils";
+
+export function Card({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return (
+    <div
+      className={cn(
+        "rounded-2xl border border-border bg-card text-card-foreground shadow-sm",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+export function CardHeader({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return (
+    <div
+      className={cn("flex flex-col space-y-1.5 p-6", className)}
+      {...props}
+    />
+  );
+}
+
+export function CardTitle({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLHeadingElement>) {
+  return (
+    <h3
+      className={cn("font-semibold leading-none tracking-tight", className)}
+      {...props}
+    />
+  );
+}
+
+export function CardDescription({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLParagraphElement>) {
+  return (
+    <p className={cn("text-sm text-muted-foreground", className)} {...props} />
+  );
+}
+
+export function CardContent({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return <div className={cn("p-6 pt-0", className)} {...props} />;
+}
+
+export function CardFooter({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return (
+    <div className={cn("flex items-center p-6 pt-0", className)} {...props} />
+  );
+}