maziggy 70622e6e53 Add proxy mode for virtual printer (cross-LAN slicer support) ...

Enable Bambu Studio on a remote network to print through BamBuddy
acting as a TLS-terminating proxy for both MQTT and FTP connections.

- Add TLSProxy base class and FTPTLSProxy with PASV response rewriting,
  EPSV→PASV translation, PROT P/C tracking, and one-shot data proxies
- Add SlicerProxyManager to coordinate per-slicer MQTT + FTP proxy pairs
- Support additional SAN IPs in certificate generation for proxy mode
- Broadcast SSDP on LAN B so slicers discover the proxy as a printer
- Narrow FTP passive port range to 50000-50100 with retry logic
- Expose proxy ports (8883, 9990, 50000-50100) in Dockerfile
- Document passive port range in docker-compose.yml

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..

__init__.py

Add virtual printer model selection

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certificate.py

Add proxy mode for virtual printer (cross-LAN slicer support)

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ftp_server.py

Add proxy mode for virtual printer (cross-LAN slicer support)

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manager.py

Add proxy mode for virtual printer (cross-LAN slicer support)

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mqtt_server.py

Add proxy mode for virtual printer (cross-LAN slicer support)

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ssdp_server.py

Add proxy mode for virtual printer (cross-LAN slicer support)

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tcp_proxy.py

Add proxy mode for virtual printer (cross-LAN slicer support)

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