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/backend/src/modules/analytics/analytics.service.ts

@@ -0,0 +1,61 @@
+import { config } from "../../shared/config/index.js";
+import { ForbiddenError, ValidationError } from "../../shared/errors/index.js";
+import { createChildLogger } from "../../shared/logger/index.js";
+import { analyticsRepository } from "./analytics.repository.js";
+import type { AnalyticsQuery } from "./analytics.schema.js";
+
+const logger = createChildLogger("analytics.service");
+
+export class AnalyticsService {
+  private assertMonitorGuild(guildId: string) {
+    if (!config.MONITOR_GUILD_ID) {
+      throw new ValidationError("MONITOR_GUILD_ID is not configured");
+    }
+
+    if (guildId !== config.MONITOR_GUILD_ID) {
+      throw new ForbiddenError("Analytics are restricted to the monitor guild");
+    }
+  }
+
+  async getOverview(query: AnalyticsQuery) {
+    this.assertMonitorGuild(query.guildId);
+    logger.debug({ query }, "Getting analytics overview");
+    return analyticsRepository.getOverview(
+      query.guildId,
+      query.channelId,
+      query.hours,
+    );
+  }
+
+  async getDailyTrend(guildId: string, hours = 24) {
+    this.assertMonitorGuild(guildId);
+    logger.debug({ guildId, hours }, "Getting daily trend");
+    return analyticsRepository.getDailyTrend(guildId, hours);
+  }
+
+  async getHourlyStats(guildId: string, hours = 24) {
+    this.assertMonitorGuild(guildId);
+    logger.debug({ guildId, hours }, "Getting hourly stats");
+    return analyticsRepository.getHourlyStats(guildId, hours);
+  }
+
+  async getTopViolators(guildId: string, limit = 10) {
+    this.assertMonitorGuild(guildId);
+    logger.debug({ guildId, limit }, "Getting top violators");
+    return analyticsRepository.getTopViolators(guildId, limit);
+  }
+
+  async getUserLeaderboard(guildId: string, limit = 10) {
+    this.assertMonitorGuild(guildId);
+    logger.debug({ guildId, limit }, "Getting user leaderboard");
+    return analyticsRepository.getUserLeaderboard(guildId, limit);
+  }
+
+  async getModerationStats(guildId: string) {
+    this.assertMonitorGuild(guildId);
+    logger.debug({ guildId }, "Getting moderation stats");
+    return analyticsRepository.getModerationStats(guildId);
+  }
+}
+
+export const analyticsService = new AnalyticsService();