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/tabs.tsx

@@ -0,0 +1,50 @@
+import * as TabsPrimitive from "@radix-ui/react-tabs";
+import type * as React from "react";
+import { cn } from "../lib/utils";
+
+export const Tabs = TabsPrimitive.Root;
+
+export function TabsList({
+  className,
+  ...props
+}: React.ComponentPropsWithoutRef<typeof TabsPrimitive.List>) {
+  return (
+    <TabsPrimitive.List
+      className={cn(
+        "inline-flex h-10 items-center justify-center rounded-lg bg-muted p-1 text-muted-foreground",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+export function TabsTrigger({
+  className,
+  ...props
+}: React.ComponentPropsWithoutRef<typeof TabsPrimitive.Trigger>) {
+  return (
+    <TabsPrimitive.Trigger
+      className={cn(
+        "inline-flex items-center justify-center whitespace-nowrap rounded-md px-3 py-1.5 text-sm font-medium transition-all focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50 data-[state=active]:bg-background data-[state=active]:text-foreground data-[state=active]:shadow-sm",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+export function TabsContent({
+  className,
+  ...props
+}: React.ComponentPropsWithoutRef<typeof TabsPrimitive.Content>) {
+  return (
+    <TabsPrimitive.Content
+      className={cn(
+        "mt-6 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring",
+        className,
+      )}
+      {...props}
+    />
+  );
+}