sprint1: agent queue worker, proxy support, auto-mark-on-navigate-away, test fixes

backend/summarizer.py

@@ -9,6 +9,11 @@ from db import DB_PATH
 
 log = logging.getLogger(__name__)
 
+def proxy_from_env():
+    """Return proxy URL from HTTP_PROXY/HTTPS_PROXY env vars, or None."""
+    return os.environ.get("HTTP_PROXY") or os.environ.get("http_proxy") or \
+           os.environ.get("HTTPS_PROXY") or os.environ.get("https_proxy") or None
+
 # Fallback pattern to retrieve the correct bytecatcode credentials
 API_KEY = os.environ.get("DEEPSEEK_API_KEY", os.environ.get("OPENAI_API_KEY", ""))
 BASE_URL = os.environ.get("DEEPSEEK_BASE_URL", "https://api.deepseek.com")
@@ -108,7 +113,7 @@ async def summarize_video(video_id: str) -> str | None:
         ]
     }
 
-    async with httpx.AsyncClient(timeout=120) as client:
+    async with httpx.AsyncClient(proxy=proxy_from_env(), timeout=120) as client:
         try:
             resp = await client.post(
                 f"{BASE_URL}/v1/chat/completions",