Increase the timeout in the main proxy for slow responding ex-apps

[kyteinsky]

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Feature request

Which Nextcloud Version are you currently using: v33.0.0

Is your feature request related to a problem? Please describe.
Gateway timeouts happen when slow responding ex-apps like context_chat_backend take their time to either index the documents or get an answer.
A similar config exists in DSP: https://github.com/nextcloud/docker-socket-proxy/?tab=readme-ov-file#slow-responding-exapps
This environment variable exists in HaRP too but the main NC proxy times out the connection.

Describe the solution you'd like
Increase the read timeout for the /exapps/ location in the main proxy config.
For nginx, the modified config would look like:

server {
    listen 80;
    server_name nextcloud.com;

    location /exapps/ {
        proxy_pass http://127.0.0.1:8780;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 1800;
    }
}

This needs to be updated for all the reverse proxy examples in the readme.