feat: add local audio test mode

src/config.ts

@@ -4,17 +4,20 @@ import { z } from "zod";
 loadDotenv();
 
 const envSchema = z.object({
-  DISCORD_BOT_TOKEN: z.string().min(1),
-  DISCORD_APPLICATION_ID: z.string().min(1),
+  DISCORD_BOT_TOKEN: z.string().min(1).optional(),
+  DISCORD_APPLICATION_ID: z.string().min(1).optional(),
   DISCORD_COMMAND_GUILD_ID: z.string().min(1).optional(),
-  OPENAI_API_KEY: z.string().min(1),
+  OPENAI_API_KEY: z.string().min(1).optional(),
   OPENAI_MODEL: z.string().min(1).default("gpt-5.4-mini"),
-  ELEVENLABS_API_KEY: z.string().min(1),
-  ELEVENLABS_VOICE_ID: z.string().min(1),
+  ELEVENLABS_API_KEY: z.string().min(1).optional(),
+  ELEVENLABS_VOICE_ID: z.string().min(1).optional(),
   ELEVENLABS_STT_MODEL: z.string().min(1).default("scribe_v2_realtime"),
   ELEVENLABS_TTS_MODEL: z.string().min(1).default("eleven_flash_v2_5"),
   BOT_DEFAULT_LANGUAGE: z.string().min(2).default("ko"),
   MAX_CONVERSATION_TURNS: z.coerce.number().int().min(4).max(30).default(12),
+  LOCAL_AUDIO_SOURCE: z.string().min(1).optional(),
+  LOCAL_AUDIO_SINK: z.string().min(1).optional(),
+  LOCAL_SPEAKER_NAME: z.string().min(1).default("local-user"),
   DEBUG_TEXT_EVENTS: z
     .string()
     .optional()
@@ -23,7 +26,41 @@ const envSchema = z.object({
 });
 
 export type AppConfig = z.infer<typeof envSchema>;
+export type AssistantRuntimeConfig = AppConfig & {
+  OPENAI_API_KEY: string;
+  ELEVENLABS_API_KEY: string;
+  ELEVENLABS_VOICE_ID: string;
+};
+export type DiscordRuntimeConfig = AssistantRuntimeConfig & {
+  DISCORD_BOT_TOKEN: string;
+  DISCORD_APPLICATION_ID: string;
+};
 
 export function loadConfig(): AppConfig {
   return envSchema.parse(process.env);
 }
+
+function requirePresent(value: string | undefined, name: string): string {
+  if (!value) {
+    throw new Error(`${name} 환경변수가 필요합니다.`);
+  }
+  return value;
+}
+
+export function requireAssistantRuntimeConfig(config: AppConfig): AssistantRuntimeConfig {
+  return {
+    ...config,
+    OPENAI_API_KEY: requirePresent(config.OPENAI_API_KEY, "OPENAI_API_KEY"),
+    ELEVENLABS_API_KEY: requirePresent(config.ELEVENLABS_API_KEY, "ELEVENLABS_API_KEY"),
+    ELEVENLABS_VOICE_ID: requirePresent(config.ELEVENLABS_VOICE_ID, "ELEVENLABS_VOICE_ID"),
+  };
+}
+
+export function requireDiscordRuntimeConfig(config: AppConfig): DiscordRuntimeConfig {
+  const assistant = requireAssistantRuntimeConfig(config);
+  return {
+    ...assistant,
+    DISCORD_BOT_TOKEN: requirePresent(config.DISCORD_BOT_TOKEN, "DISCORD_BOT_TOKEN"),
+    DISCORD_APPLICATION_ID: requirePresent(config.DISCORD_APPLICATION_ID, "DISCORD_APPLICATION_ID"),
+  };
+}