docs: обновил документацию

backend/UniVerse.Api/Program.cs

@@ -29,7 +29,7 @@ builder.Services.AddDbContext<AppDbContext>(options =>
         npgsql =>
         {
             npgsql.EnableRetryOnFailure(3);
-            npgsql.MigrationsAssembly("UniVerse.Infrastructure");
+            npgsql.MigrationsAssembly("UniVerse.Infrastructure"); // Указывает EF Core, в какой сборке искать/хранить миграции.
         });
 });
 
@@ -50,7 +50,7 @@ builder.Services.AddAuthentication(options =>
         ValidIssuer = builder.Configuration["Jwt:Issuer"],
         ValidAudience = builder.Configuration["Jwt:Audience"],
         IssuerSigningKey = new SymmetricSecurityKey(
-            Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Secret"] ?? "default-dev-secret-key-change-in-production-32chars!!"))
+            Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Secret"]!))
     };
 });
 builder.Services.AddAuthorization();
@@ -114,7 +114,7 @@ builder.Services.AddSwaggerGen(options =>
     {
         Title = "UniVerse API",
         Version = "v1",
-        Description = "University schedule, reviews, and gamification platform"
+        Description = "Universe"
     });
 
     options.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme