fix(api): remove enable_compression to restore real SSE streaming

The HTTP compression buffer in aiohttp held all SSE chunks until
the stream ended, making streaming appear batched instead of
incremental. SSE payloads are small and frequent, so compression
provides negligible benefit while breaking real-time delivery.

nanobot/api/server.py

@@ -239,7 +239,6 @@ async def handle_chat_completions(request: web.Request) -> web.Response:
         resp.content_type = "text/event-stream"
         resp.headers["Cache-Control"] = "no-cache"
         resp.headers["Connection"] = "keep-alive"
-        resp.enable_compression()
         await resp.prepare(request)
 
         chunk_id = f"chatcmpl-{uuid.uuid4().hex[:12]}"