feat(gmw): public features #7-14 — scam domains, top channels, hourly heatmap, category drill-down, coverage stats, channel culture glossary, term KB, edit history

ALSO fixes: dashboard.repository still JOINed dropped user_reputations table (listUsers/getUserDetail crash).

services/backend/src/modules/knowledge/knowledge.service.ts

@@ -0,0 +1,18 @@
+import { createChildLogger } from "../../shared/logger/index.js";
+import { knowledgeRepository } from "./knowledge.repository.js";
+
+const logger = createChildLogger("knowledge.service");
+
+export class KnowledgeService {
+  async listChannelCultures(limit = 50, search?: string) {
+    logger.debug({ limit, search }, "Listing channel cultures");
+    return knowledgeRepository.listChannelCultures(limit, search);
+  }
+
+  async listGlossary(limit = 50, search?: string) {
+    logger.debug({ limit, search }, "Listing glossary terms");
+    return knowledgeRepository.listGlossary(limit, search);
+  }
+}
+
+export const knowledgeService = new KnowledgeService();