feat: scaffold realtime Korean voice assistant bot

src/config.ts

@@ -0,0 +1,29 @@
+import { config as loadDotenv } from "dotenv";
+import { z } from "zod";
+
+loadDotenv();
+
+const envSchema = z.object({
+  DISCORD_BOT_TOKEN: z.string().min(1),
+  DISCORD_APPLICATION_ID: z.string().min(1),
+  DISCORD_COMMAND_GUILD_ID: z.string().min(1).optional(),
+  OPENAI_API_KEY: z.string().min(1),
+  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_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),
+  DEBUG_TEXT_EVENTS: z
+    .string()
+    .optional()
+    .transform((value) => value === "true"),
+  LOG_LEVEL: z.enum(["debug", "info", "warn", "error"]).default("info"),
+});
+
+export type AppConfig = z.infer<typeof envSchema>;
+
+export function loadConfig(): AppConfig {
+  return envSchema.parse(process.env);
+}