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/entities/guild/types.ts

@@ -0,0 +1,12 @@
+export interface Guild {
+  id: string;
+  name: string;
+  icon: string | null;
+}
+
+export interface Channel {
+  id: string;
+  name: string;
+  type?: string;
+  parentId?: string | null;
+}

services/frontend/src/entities/media/types.ts

@@ -0,0 +1,17 @@
+export type MediaMode = "music" | "screen";
+
+export interface MediaItem {
+  id?: string;
+  source: string;
+  title: string;
+  mode?: MediaMode;
+  durationMs?: number | null;
+  thumbnailUrl?: string | null;
+}
+
+export interface MediaState {
+  playing: boolean;
+  musicVolume: number;
+  current: MediaItem | null;
+  queue: MediaItem[];
+}

services/frontend/src/entities/message/types.ts

@@ -0,0 +1,47 @@
+export type AIStatus = "pending" | "clean" | "warn" | "flagged" | "error";
+export type AISeverity = "none" | "low" | "medium" | "high" | "critical";
+export type AIRecommendedAction =
+  | "none"
+  | "monitor"
+  | "warn"
+  | "review"
+  | "delete"
+  | "escalate";
+
+export interface MessageMetadata {
+  stickers?: Array<{ name?: string; url?: string }>;
+  attachments?: Array<{ name: string; url: string; contentType?: string }>;
+  embeds?: Array<{ title?: string; image?: string; thumbnail?: string }>;
+}
+
+export interface MessageRecord {
+  id: string;
+  guild_id: string;
+  channel_id: string;
+  thread_id: string | null;
+  user_id: string;
+  username: string;
+  avatar_url: string | null;
+  content: string;
+  edited_content: string | null;
+  created_at: number;
+  edited_at: number | null;
+  deleted_at: number | null;
+  type: "text" | "edited" | "deleted";
+  metadata: string | null;
+  ai_status?: AIStatus | null;
+  ai_moderation_flags?: string | null;
+  ai_moderation_score?: number | null;
+  ai_analysis?: string | null;
+  ai_categories?: string | null;
+  ai_severity?: AISeverity | null;
+  ai_confidence?: number | null;
+  ai_recommended_action?: AIRecommendedAction | null;
+  ai_analyzed_at?: number | null;
+  ai_error?: string | null;
+}
+
+export interface PageResult<T> {
+  data: T[];
+  nextCursor: string | null;
+}

services/frontend/src/entities/ui/types.ts

@@ -0,0 +1,14 @@
+export type DashboardTab = "live" | "messages" | "analytics";
+
+export interface UIState {
+  selectedGuild?: string;
+  selectedVoiceGuild?: string;
+  selectedVoiceChannel?: string;
+  selectedTextGuild?: string;
+  selectedTextChannel?: string;
+  selectedAnalyticsGuild?: string;
+  selectedAnalyticsChannel?: string;
+  activeTab?: DashboardTab;
+  isListening?: boolean;
+  isStreaming?: boolean;
+}

services/frontend/src/entities/voice/types.ts

@@ -0,0 +1,14 @@
+export interface VoiceStatus {
+  connected: boolean;
+  activeGuildId?: string | null;
+  activeChannelId?: string | null;
+  activeChannelName?: string | null;
+}
+
+export interface ActiveSpeaker {
+  id?: string;
+  userId?: string;
+  username: string;
+  avatar: string;
+  speaking: boolean;
+}