feat(deploy): full one-line install with search API

Bundle static site, FastAPI search, nginx proxy, and systemd unit so
a fresh Ubuntu VPS can run curl install.sh and get /search working.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/data/site-config.json.example

@@ -0,0 +1,5 @@
+{
+  "server_ip": "SERVER_IP",
+  "telegram_proxy": "https://t.me/proxy?server=YOUR_SERVER&port=443&secret=YOUR_SECRET",
+  "telegram_proxy_label": "Прокси Telegram"
+}