Refactor OpenViking Memory API and User Management

- Updated API authentication headers to use `X-API-Key` for both admin and user APIs.
- Modified the account creation process to directly create user-specific accounts without requiring an admin workspace.
- Enhanced user creation to return account-specific details, including `admin_user_id`.
- Introduced new endpoints for retrieving task status and user profiles, allowing for more flexible user data management.
- Updated search functionality to include additional parameters such as `level` and `score_threshold`.
- Improved the handling of user keys in the storage layer to associate them with specific accounts.
- Added tests to validate the new user account creation process and search functionalities, ensuring proper integration with the OpenViking service.
- Included new documentation to reflect changes in API usage and expected request/response formats.

tests/test_memory_system_server.py

@@ -14,6 +14,20 @@ def test_memory_system_server_exposes_routes():
     assert {"GET", "POST"} <= context_methods
     assert "/memory-system/search" in paths
     assert "/memory-system/users/{user_id}/profile" in paths
+    task_methods = {
+        method
+        for route in app.routes
+        if getattr(route, "path", "") == "/memory-system/openviking/tasks/{task_id}"
+        for method in getattr(route, "methods", set())
+    }
+    profile_methods = {
+        method
+        for route in app.routes
+        if getattr(route, "path", "") == "/memory-system/users/{user_id}/profile"
+        for method in getattr(route, "methods", set())
+    }
+    assert {"GET", "POST"} <= task_methods
+    assert {"GET", "POST"} <= profile_methods
 
 
 def test_memory_system_messages_does_not_require_account_key_header():