WIP checkpoint: Architecture: ApiClient autoload (HTTP + JWT + error contract)

scripts/api_client.gd

@@ -172,16 +172,17 @@ func _on_http_request_completed(
 	var detail: String = ""
 
 	if response_code >= 200 and response_code < 300:
-		# Success — try to parse JSON.
+		# Success — try to parse JSON (works for both objects and arrays).
 		var parse_result = JSON.parse_string(json_string)
-		if parse_result is Dictionary:
+		if parse_result is Dictionary or parse_result is Array:
 			data = parse_result
-			# Extract backend detail if present.
-			if data.has("detail"):
+			# Extract backend detail if present (e.g. {"ok": true, "detail": "OK"}).
+			if data is Dictionary and data.has("detail"):
 				detail = str(data["detail"])
 			else:
 				detail = "OK"
 		else:
+			# Not valid JSON — return raw string.
 			data = json_string
 			detail = "OK"
 	else: