Implement media storage and processing features: update configuration in .env.example and appsettings files, enhance Docker setup for media storage, and add media-related services and database entities. Include ffmpeg for media handling and adjust Kestrel settings for large file uploads.

backend/src/TeleWave.Infrastructure/Persistence/AppDbContext.cs

@@ -2,6 +2,7 @@ using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore;
 using TeleWave.Application.Common.Interfaces;
 using TeleWave.Domain.Auth;
+using TeleWave.Domain.Media;
 using TeleWave.Infrastructure.Identity;
 
 namespace TeleWave.Infrastructure.Persistence;
@@ -15,6 +16,7 @@ public class AppDbContext(DbContextOptions<AppDbContext> options)
         IAppDbContext
 {
     public DbSet<RefreshToken> RefreshTokens => Set<RefreshToken>();
+    public DbSet<MediaAsset> MediaAssets => Set<MediaAsset>();
 
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {