fix: workspace delete mixed-content error via top-level endpoint

- Add top-level DELETE /workspaces/{workspace_id} endpoint (avoids nested path)
- Frontend deleteWorkspace now uses /workspaces/{id}/?force=... (no project/repo needed)
- Update useWorkspaceActions, ProjectsPage, WorkspacesPage to match new signature

Quality gates: ruff clean, tsc --noEmit clean, pytest workspaces API (9 passed, 1 skipped)

apps/web/src/api/workspaces.ts

@@ -71,13 +71,11 @@ export async function updateWorkspace(
 }
 
 export async function deleteWorkspace(
-	projectId: string,
-	repoId: string,
 	workspaceId: string,
 	force = false,
 ): Promise<{ status: string }> {
 	const response = await apiClient.delete<{ status: string }>(
-		`${workspaceUrl(projectId, repoId, workspaceId)}?force=${force}`,
+		`/workspaces/${workspaceId}/?force=${force}`,
 	);
 	return response.data;
 }