fix(discord): use correct slash command context type in AddApplicationCommands

The default AddApplicationCommands() registers ApplicationCommandService<ApplicationCommandContext>,
but our modules inherit ApplicationCommandModule<SlashCommandContext>. Because SlashCommandContext
does not inherit from ApplicationCommandContext in NetCord, AddModules(typeof(Program).Assembly)
failed to discover the modules, so /newsession, /listsessions, /reschedule were never published
to Discord. Only /ping worked because it uses the minimal API route.

Fix: specify AddApplicationCommands<SlashCommandInteraction, SlashCommandContext>() so the
service matches the module context type, allowing module discovery to succeed.

Bump version to 3.0.4.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/GmRelay.DiscordBot/Program.cs

@@ -21,6 +21,7 @@ using NetCord.Hosting.Gateway;
 using NetCord.Hosting.Services;
 using NetCord.Hosting.Services.ApplicationCommands;
 using NetCord.Hosting.Services.ComponentInteractions;
+using NetCord.Services.ApplicationCommands;
 using NetCord.Services.ComponentInteractions;
 using Npgsql;
 
@@ -83,7 +84,7 @@ builder.Services
         options.Token = discordOptions.Token;
         options.Intents = GatewayIntents.Guilds;
     })
-    .AddApplicationCommands()
+    .AddApplicationCommands<SlashCommandInteraction, SlashCommandContext>()
     .AddComponentInteractions<ButtonInteraction, ButtonInteractionContext>()
     .AddGatewayHandlers(typeof(Program).Assembly);
 

src/GmRelay.Web/Components/Layout/NavMenu.razor

@@ -73,7 +73,7 @@
                     </button>
                 </form>
 
-                <div class="nav-version">v3.0.3</div>
+                <div class="nav-version">v3.0.4</div>
             </div>
         </Authorized>
         <NotAuthorized>