fix(backend): disable reasoning and fallback to reasoning field

Set reasoning effort to none in the LLM client to reduce latency
and token usage. Fall back to the reasoning field when content is
absent in the response.

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

apps/aelis-backend/src/enhancement/llm-client.ts

@@ -50,11 +50,13 @@ export function createLlmClient(config: LlmClientConfig): LlmClient {
 							schema: enhancementResultJsonSchema,
 						},
 					},
+					reasoning: { effort: "none" },
 					stream: false,
 				},
 			})
 
-			const content = response.choices?.[0]?.message?.content
+			const message = response.choices?.[0]?.message
+			const content = message?.content ?? message?.reasoning
 			if (typeof content !== "string") {
 				console.warn("[enhancement] LLM returned no content in response")
 				return null