Add reverse proxy masking and Cloudflare panel SSL via DNS-01.

Introduce Caddy-based reverse proxy with decoy site and DPI masking, plus automatic Let's Encrypt certificate issuance for the panel through Cloudflare API without binding port 443.

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

managers/__init__.py

@@ -0,0 +1,7 @@
+"""Protocol/service/SSH managers used by the web panel.
+
+Modules in this package are imported either directly (`from managers.ssh_manager import SSHManager`)
+or lazily by name through `app.get_protocol_manager`. Keeping them in a dedicated package
+makes the project root easier to scan and prevents accidental name collisions with the
+generic stdlib (e.g. `socks5_manager`, `dns_manager`).
+"""