fix(network): apply HTTP proxy to Anna's Archive download-count lookups (#1686)

Fixes #1685

`_fetch_download_count_inline` fetches `/dyn/md5/inline_info/<md5>` for
every search result (5 workers) through a module-level
`requests.Session`, with no `proxies=`. `get_proxies()` reads the app
config rather than the environment, so with the proxy set in Settings →
Network the search page and the bypasser used it while these requests
left from the host's own IP, about 50 per search. It now passes
`network.get_proxies(url)` on each request, as the Libgen fast path in
the same file already does. The session stays module-level for
keep-alive, and proxies are resolved per request, so a settings change
applies without a restart.

Verification (macOS, `uv run --frozen pytest`):
- New `tests/direct_download/test_download_count_proxy.py` passes. With
the source change reverted it fails (`proxies` is `None`).
- `tests/direct_download`: 135 passed, including
`test_download_count_reuse.py`.
- `ruff check` and `ruff format --check` on the changed files pass.
- Not re-run live with this branch built. The behaviour before the
change was observed on a running v1.6.2 container: 5 sockets from the
`ThreadPoolExecutor` threads straight to the AA mirror's IP on :443, and
1 to the proxy.

🤖 Generated with [Claude Code](https://claude.com/claude-code)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

<!-- coderabbit-ai-generated:v1 -->

## Summary by CodeRabbit

* **Bug Fixes**
* Anna’s Archive download counts are now retrieved using the configured
network proxies. This improves access to download-count information in
environments where requests need a proxy, while preserving the existing
response handling and timeout behavior.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>

shelfmark/release_sources/direct_download/annas_archive.py

@@ -840,7 +840,12 @@ def _fetch_download_count_inline(book_id: str) -> int | None:
         return cached
     try:
         url = f"{network.get_aa_base_url()}/dyn/md5/inline_info/{book_id}"
-        resp = _inline_info_session.get(url, timeout=5, headers={"Accept": "application/json"})
+        resp = _inline_info_session.get(
+            url,
+            timeout=5,
+            headers={"Accept": "application/json"},
+            proxies=network.get_proxies(url),
+        )
         if resp.status_code == 200:
             data = resp.json()
             count = data.get("downloads_total")

tests/direct_download/test_download_count_proxy.py

@@ -0,0 +1,43 @@
+"""AA download-count lookups must honor the Network proxy settings.
+
+`_fetch_download_count_inline` runs for every search result, on its own session, so a
+lookup that skips `get_proxies` sends the whole list straight from the host's IP while
+the search page itself goes through the configured proxy.
+"""
+
+from unittest.mock import MagicMock
+
+import pytest
+import requests
+
+from shelfmark.release_sources.direct_download import annas_archive as aa
+
+_PROXIES = {"http": "http://10.0.80.3:8118", "https": "http://10.0.80.3:8118"}
+
+
+@pytest.fixture(autouse=True)
+def _fresh_cache(monkeypatch):
+    aa._download_count_cache.clear()
+    monkeypatch.setattr(aa.network, "get_aa_base_url", lambda: "https://annas-archive.gl")
+    yield
+    aa._download_count_cache.clear()
+
+
+def test_download_count_lookup_passes_configured_proxies(monkeypatch):
+    asked_for: list[str] = []
+    captured: dict[str, object] = {}
+
+    def fake_get_proxies(url=""):
+        asked_for.append(url)
+        return _PROXIES
+
+    def fake_request(_self, _method, _url, *_args, **kwargs):
+        captured.update(kwargs)
+        return MagicMock(status_code=200, json=MagicMock(return_value={"downloads_total": 7}))
+
+    monkeypatch.setattr(aa.network, "get_proxies", fake_get_proxies)
+    monkeypatch.setattr(requests.Session, "request", fake_request)
+
+    assert aa._fetch_download_count_inline("aaa") == 7
+    assert captured.get("proxies") == _PROXIES
+    assert asked_for == ["https://annas-archive.gl/dyn/md5/inline_info/aaa"]