feat(characters): support character-scoped conversations

src/data/schemas/character/character.ts

@@ -0,0 +1,13 @@
+import { z } from "zod";
+
+export const CharacterSchema = z.object({
+  id: z.string().min(1).max(64),
+  slug: z.string().regex(/^[a-z0-9]+(?:-[a-z0-9]+)*$/),
+  displayName: z.string().trim().min(1).max(80),
+  avatarUrl: z.url().refine((url) => url.startsWith("https://"), {
+    message: "avatarUrl must use HTTPS",
+  }),
+});
+
+export type CharacterInput = z.input<typeof CharacterSchema>;
+export type CharacterData = z.output<typeof CharacterSchema>;