fix: pass SSH keys and config profile to startInstance in create form

The create-session-form was calling startInstance() without passing the
selected config profile and SSH keys. This caused the backend to receive
ssh_key_ids=[] and clear the keys that were stored during createInstance.
The .ssh directory was never mounted because instance.ssh_key_ids was
wiped during the start call.

Also includes minor formatting cleanup on the data migration.

Quality gates: pytest (18 passed)

apps/web/src/components/create-session-form.tsx

@@ -171,7 +171,13 @@ export const CreateSessionForm = ({
       );
 
       setProgress("Starting container...");
-      await startInstance(projectId, repoId, instance.id);
+      await startInstance(
+        projectId,
+        repoId,
+        instance.id,
+        selectedConfigProfile || undefined,
+        selectedSshKeyIds.length > 0 ? selectedSshKeyIds : undefined
+      );
 
       // Reset form
       if (!fixedProjectId) setSelectedProject("");