feat: create route to fetch episodes for a title

Summary:

Test Plan:

src/types/schema.ts

@@ -19,6 +19,7 @@ export const PaginatedResponseSchema = <T extends ZodSchema>(schema: T) => {
   });
 };
 
+export const ErrorResponse = { success: false } as const;
 export const ErrorResponseSchema = z.object({
   success: z.literal(false).openapi({ type: "boolean" }),
 });
@@ -29,3 +30,11 @@ export const AniListIdSchema = z.number().int().openapi({ format: "int64" });
 export const AniListIdQuerySchema = z
   .string()
   .openapi({ type: "integer", format: "int64" });
+
+export const EpisodeNumberSchema = z.number().openapi({
+  minimum: 0,
+  multipleOf: 0.5,
+  examples: [1, 2, 3.5],
+  type: "number",
+  format: "float",
+});