feat: implement admin authentication overlay and API integration for secure access to voice and media controls

src/config.ts

@@ -76,6 +76,7 @@ const configSchema = z
     POSTGRES_DB: z.string().optional(),
     POSTGRES_POOL_MIN: z.coerce.number().int().positive().default(2),
     POSTGRES_POOL_MAX: z.coerce.number().int().positive().default(10),
+    ADMIN_PASSWORD: z.string().default("admin123"),
   })
   .superRefine((value, ctx) => {
     if (!value.AI_ANALYSIS_ENABLED) {