fix: route alert YouTube/SearXNG through pooled urlopen

- YouTube InnerTube search: urllib.request.urlopen -> _urlopen (gets
  connection pooling + SOCKS5 proxy)
- SearXNG search: urllib.request.urlopen -> _urlopen(proxy=False)
  (local service, skip proxy, get pooling)
- Update 5 tests to patch _urlopen instead of urllib.request.urlopen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TASKS.md

@@ -23,7 +23,7 @@
 | P0 | [x] | `plugins/searx.py` -- route through `derp.http.urlopen(proxy=False)` |
 | P1 | [x] | Connection pool: `preload_content=True` + `_PooledResponse` wrapper for connection reuse |
 | P1 | [x] | Pool tuning: `num_pools=30, maxsize=8` (was 20/4) |
-| P2 | [ ] | Audit remaining plugins for unnecessary proxy routing |
+| P2 | [x] | Audit remaining plugins for unnecessary proxy routing |
 
 ## Previous Sprint -- Music Discovery via Last.fm (2026-02-22)
 

plugins/alert.py

@@ -436,7 +436,7 @@ def _search_youtube(keyword: str) -> list[dict]:
     req = urllib.request.Request(_YT_SEARCH_URL, data=payload, method="POST")
     req.add_header("Content-Type", "application/json")
 
-    resp = urllib.request.urlopen(req, timeout=_FETCH_TIMEOUT)
+    resp = _urlopen(req, timeout=_FETCH_TIMEOUT)
     raw = resp.read()
     resp.close()
 
@@ -545,7 +545,7 @@ def _search_searx(keyword: str) -> list[dict]:
         })
         req = urllib.request.Request(f"{_SEARX_URL}?{params}", method="GET")
         try:
-            resp = urllib.request.urlopen(req, timeout=_FETCH_TIMEOUT)
+            resp = _urlopen(req, timeout=_FETCH_TIMEOUT, proxy=False)
             raw = resp.read()
             resp.close()
         except Exception as exc:

tests/test_alert.py

@@ -420,7 +420,7 @@ class TestExtractVideos:
             def close(self):
                 pass
 
-        with patch("urllib.request.urlopen", return_value=FakeResp()):
+        with patch.object(_mod, "_urlopen", return_value=FakeResp()):
             results = _search_youtube("test")
         assert len(results) == 1
         assert results[0]["id"] == "dup1"
@@ -438,7 +438,7 @@ class TestSearchYoutube:
             def close(self):
                 pass
 
-        with patch("urllib.request.urlopen", return_value=FakeResp()):
+        with patch.object(_mod, "_urlopen", return_value=FakeResp()):
             results = _search_youtube("test query")
         assert len(results) == 2
         assert results[0]["id"] == "abc123"
@@ -446,7 +446,7 @@ class TestSearchYoutube:
 
     def test_http_error_propagates(self):
         import pytest
-        with patch("urllib.request.urlopen", side_effect=ConnectionError("fail")):
+        with patch.object(_mod, "_urlopen", side_effect=ConnectionError("fail")):
             with pytest.raises(ConnectionError):
                 _search_youtube("test")
 
@@ -1263,7 +1263,7 @@ class TestSearchSearx:
             def close(self):
                 pass
 
-        with patch("urllib.request.urlopen", return_value=FakeResp()):
+        with patch.object(_mod, "_urlopen", return_value=FakeResp()):
             results = _search_searx("test query")
         # Same response served for all categories; deduped by URL
         assert len(results) == 3
@@ -1281,13 +1281,13 @@ class TestSearchSearx:
             def close(self):
                 pass
 
-        with patch("urllib.request.urlopen", return_value=FakeResp()):
+        with patch.object(_mod, "_urlopen", return_value=FakeResp()):
             results = _search_searx("nothing")
         assert results == []
 
     def test_http_error_returns_empty(self):
         """SearXNG catches per-category errors; all failing returns empty."""
-        with patch("urllib.request.urlopen", side_effect=ConnectionError("fail")):
+        with patch.object(_mod, "_urlopen", side_effect=ConnectionError("fail")):
             results = _search_searx("test")
         assert results == []