[FEATURE] Pikaraoke should run on a single port (proxy http requests to ffmpeg streams)

[vicwomg]

Description
People who are hosting pikaraoke are running into issues due to ffmpeg streaming on a different port. This makes it difficult to host pikaraoke outside of the LAN because multiple ports would need to be forwarded. Also, it seems as though Safari is struggling to stream from port 556 #299

Describe the solution you'd like
Have pikaraoke flask server proxy the ffmpeg stream URL, in specific location like /stream

Describe alternatives you've considered
Other solutions involved overriding the ffmpeg url + router proxying or using nginx proxies to achieve the same thing. Too complex for most users.

Additional context
#293 #301

[honestlai]

Already pulled this into my docker setup... works like a charm 🍻

[vicwomg]

This is on hold because it appears to cause issues with transcoded files when streaming remotely. mp3 + cdg, non-mp4 video formats, and transposed audio will be transcoded.

[frankchau93]

Already pulled this into my docker setup... works like a charm 🍻

What's your docker setup look like?