feat(redirect80): new HTTP→HTTPS redirect service on port 80

Pure Python stdlib http.server + ThreadingMixIn, zero web framework deps.
- GET/HEAD → 301, POST/PUT/DELETE/PATCH → 308
- Reads Host header, strips port, redirects to https://{host}{path}
- Config via confs (retry_on_refused, hard dependency) + env var override
- Logs via log_client → db Logs table (fail-safe async batch)
- Port 80 privilege via setcap cap_net_bind_service in _run.sh

redirect80/_set.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+cd "$(dirname "$0")" || exit
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple