fix(backend): reject unknown fields in source config (#88)

Add "+": "reject" to all arktype schemas so undeclared
keys return 400. Sources without a configSchema now
reject the config field entirely at the HTTP layer.

Co-authored-by: Ona <no-reply@ona.com>

apps/aelis-backend/src/tfl/provider.ts

@@ -8,6 +8,7 @@ export type TflSourceProviderOptions =
 	| { apiKey?: never; client: ITflApi }
 
 export const tflConfig = type({
+	"+": "reject",
 	"lines?": "string[]",
 })