feat(backend): add GET /api/sources/:sourceId

Return { enabled, config } for a user's source. Defaults to
{ enabled: false, config: {} } when no row exists.

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

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

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