feat: enhance profile path resolution and add example profiles for better project adaptability

profiles/example/workspace.json

@@ -0,0 +1,8 @@
+{
+  "profile": "example",
+  "display_name": "Example Project",
+  "description": "Sanitized example profile for adapting AI Workspace to a new project.",
+  "knowledge_dir": "workspaces/example/project-knowledge",
+  "inbox_dir": "workspaces/example/inbox",
+  "index_dir": ".aiw/indexes/example"
+}