feat: Add slashcommand api

toju-app/src/app/domains/plugins/application/services/plugin-client-api.service.ts

@@ -39,6 +39,7 @@ import type {
   PluginApiCustomStreamRequest,
   PluginApiMessageAsPluginUserRequest,
   PluginApiServerSettingsUpdate,
+  PluginApiSlashCommandContext,
   PluginApiTypingEvent,
   TojuClientPluginApi,
   TojuPluginDisposable
@@ -77,6 +78,16 @@ export class PluginClientApiService {
     const assertEvent = (eventName: string): void => this.assertDeclaredEvent(manifest, eventName);
 
     return deepFreeze<TojuClientPluginApi>({
+      commands: {
+        list: () => {
+          requireCapability('ui.commands');
+          return this.uiRegistry.slashCommands();
+        },
+        register: (id, contribution) => {
+          requireCapability('ui.commands');
+          return this.uiRegistry.registerSlashCommand(pluginId, id, contribution);
+        }
+      },
       channels: {
         addAudioChannel: (request) => {
           requireCapability('channels.manage');
@@ -513,6 +524,15 @@ export class PluginClientApiService {
     };
   }
 
+  createSlashCommandContext(request: { args: Record<string, string>; command: string; rawArgs: string }): PluginApiSlashCommandContext {
+    return {
+      ...this.createActionContext('slashCommand'),
+      args: request.args,
+      command: request.command,
+      rawArgs: request.rawArgs
+    };
+  }
+
   private assertDeclaredEvent(manifest: TojuPluginManifest, eventName: string): void {
     const declared = manifest.events?.some((event) => event.eventName === eventName) ?? false;