feat(geplante-nachrichten): scheduled message rule engine with bot delivery, admin UI, and manual trigger

backend/src/app.ts

@@ -110,6 +110,7 @@ import ausruestungTypRoutes    from './routes/ausruestungTyp.routes';
 import buchhaltungRoutes        from './routes/buchhaltung.routes';
 import personalEquipmentRoutes  from './routes/personalEquipment.routes';
 import toolConfigRoutes         from './routes/toolConfig.routes';
+import scheduledMessagesRoutes  from './routes/scheduledMessages.routes';
 
 app.use('/api/auth',        authRoutes);
 app.use('/api/user',        userRoutes);
@@ -142,6 +143,7 @@ app.use('/api/ausruestung-typen', ausruestungTypRoutes);
 app.use('/api/buchhaltung',      buchhaltungRoutes);
 app.use('/api/persoenliche-ausruestung', personalEquipmentRoutes);
 app.use('/api/admin/tools',            toolConfigRoutes);
+app.use('/api/scheduled-messages',     scheduledMessagesRoutes);
 
 // Static file serving for uploads (authenticated)
 const uploadsDir = process.env.NODE_ENV === 'production' ? '/app/uploads' : path.resolve(__dirname, '../../uploads');