feat(ui): add Adaptive Prompt Tuner tab with correction submission UI

- Add pgCorrectedModerationsTable to shared schema
- Create backend corrections module (stats, list, create endpoints)
- Add TunerPanel with Stats, History, and Submit sub-tabs
- Add AuthOverlay gate for Tuner (admin-only, same as Live)
- Set messages as default tab
- Wire Tuner into sidebar, header, and mobile tab bar

Co-Authored-By: Claude <noreply@anthropic.com>

services/backend/src/http/app.ts

@@ -9,6 +9,7 @@ import helmet from "helmet";
 import { createAnalysisRouter } from "../modules/analysis/analysis.routes.js";
 import { createAuthRouter } from "../modules/auth/auth.routes.js";
 import { createConfigRouter } from "../modules/config/config.routes.js";
+import { createCorrectionsRouter } from "../modules/corrections/corrections.routes.js";
 import { createHealthRouter } from "../modules/health/health.routes.js";
 import { createMascotChatRouter } from "../modules/mascot-chat/mascot-chat.routes.js";
 import { createMediaRouter } from "../modules/media/media.routes.js";
@@ -63,6 +64,7 @@ export function createHttpApp(): Express {
   // API routes
   app.use("/api", createAuthRouter());
   app.use("/api", createConfigRouter());
+  app.use("/api", createCorrectionsRouter());
   app.use("/api", createMessagesRouter());
   app.use("/api", createAnalysisRouter());
   app.use("/api", createMascotChatRouter());