refactor: Break apart monolithic configuration schema (#1977)

[skip ci]

src/config/schema/remote-control.ts

@@ -0,0 +1,11 @@
+import { z } from 'zod';
+
+export const remoteControlConfigSchema = z
+  .object({
+    entities: z
+      .object({
+        camera: z.string().startsWith('input_select.').optional(),
+      })
+      .optional(),
+  })
+  .optional();