chore: fix unused imports in tests and update development roadmap

tests/api/fleet/test_mutate_interval.py

@@ -2,13 +2,11 @@
 Tests for the mutate interval API endpoint.
 """
 
-import json
 import pytest
 import httpx
-from unittest.mock import patch, MagicMock
+from unittest.mock import patch
 from pathlib import Path
 
-import decnet.config
 from decnet.config import DeckyConfig, DecnetConfig
 
 

tests/api/stream/test_stream_events.py

@@ -2,12 +2,10 @@
 Tests for the SSE stream endpoint (decnet/web/router/stream/api_stream_events.py).
 """
 
-import json
 import pytest
 import httpx
-import asyncio
 
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import AsyncMock, patch
 
 
 # ── Stream endpoint tests ─────────────────────────────────────────────────────