Fix relative import path in extensionManager.ts

Use @/ alias for log import to be consistent with other service imports.

Author: ammar-agent

.cmux/tool-usage.log.tmp.1762567777645

@@ -22,7 +22,7 @@ import type {
 } from "@/types/extensions";
 import { discoverExtensions } from "@/utils/extensions/discovery";
 import { createRuntime } from "@/runtime/runtimeFactory";
-import { log } from "../log";
+import { log } from "@/services/log";
 
 /**
  * Extension manager for handling a single global extension host