docs: update reverse proxy flow diagram (PNG)

[Ra9huvansh]

This PR updates the reverse proxy flow diagram (PNG) to align with the
GraphQL access changes introduced in #1450.

The SVG hasn’t been updated yet due to the lack of an updated source. Other
documentation is left unchanged to keep the scope of this PR minimal.

[coderabbitai]

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[adamoutler]

#1450 was not created in this way. #1468 was implemented instead and will be merged shortly. There are now two workflows and the one in the picture is not required.

Default

flowchart LR
  B[Browser]

  subgraph NAC[NetAlertX Container]
    N[Nginx listening on port 20211]
    A[Service on port 20212]
    N -->|Proxy /server to localhost:20212| A
  end

  B -->|port 20211| N
  B -->|port 20212| A

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With proxies

flowchart LR
  B[Browser] -->|HTTPS| S[Any Auth/SSL proxy]
  B --> G[Any API consumer<br> eg. Grafana]
  subgraph NAC[NetAlertX Container]
    N[Nginx listening on port 20211]
    N -->|Proxy /server to localhost:20212| A[Service on port 20212]
  end
  S -->|port 20211| NAC
  G -->|port 20212| NAC

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[Ra9huvansh]

Thanks for clarifying!

Got it. I was working based on #1450. If #1468 replaces that approach
and this diagram isn’t needed anymore, I’m happy to close the PR.