fix: disable strict mode for enhancement JSON schema (#99)

strict: true requires all property names to be known upfront,
which is incompatible with the dynamic-key maps in slotFills.
Also replace type array with anyOf for nullable slot values.

apps/aelis-backend/src/enhancement/schema.ts

@@ -31,7 +31,7 @@ export const enhancementResultJsonSchema = {
 			additionalProperties: {
 				type: "object",
 				additionalProperties: {
-					type: ["string", "null"],
+					anyOf: [{ type: "string" }, { type: "null" }],
 				},
 			},
 		},