feat: add admin dashboard with basic auth and update README for configuration and API details

Backend/index.ts

@@ -3,6 +3,7 @@ import express from 'express';
 
 import authRoutes from './routes/auth';
 import videosRoutes from './routes/videos';
+import adminRoutes from './routes/admin';
 import { ensureMinioBucket } from './utils/minio';
 
 const app = express();
@@ -15,6 +16,7 @@ app.get('/', (_req, res) => {
 
 app.use('/auth', authRoutes);
 app.use('/videos', videosRoutes);
+app.use('/admin', adminRoutes);
 
 app.use((err: unknown, _req: express.Request, res: express.Response, _next: express.NextFunction) => {
   console.error(err);