Server

Not possible. There is no need for that either.
Server itself doesn't eat cpu power nor ram, if you want to transfer character between multiple PC's just make a cloud storage and throw profile there.
It's in user/profiles.

It should be possible. SPT-AKI server is just a web server started at localhost 127.0.0.1:443 by default.

You will need a mod to override IP address and post to look for server not at localhost (127.0.0.1) but at different IP in your LAN.

Ereshkigal-AkiConfigurator Version 1.3.1 has settings for this:

Quote

[Added] Server IP and Port configuration

Note: through it should be possible to have server on one PC and connect from clients from other PCs if configured correctly, there will be no matchmaking so each client connected to dedicated server will still play only solo as is it plays from localhost server on the same PC.

As of now, the server doesn't respond to a remote launcher with the login response. It cannot progress past the "login" page of the launcher.

First of all, Eresh Config still doesn't override actual IP and PORT, because she still tries to override one from source configs rather the one Senko've made in database/server.json
Here's proof of my words

It was like that on previous versions, got removed, now she does the same again.

(Task Manager>Network>Netstat -an, no showings on my internal ip.)
So don't use AkiConfig, go straight to where Senko pointed out, can confirm it works.

Second of all, i wouldn't be sure if i haven't tried myself.
It won't go past connect, I bet it's caused either because of certificates or because server can't handle external connections or because it requires a files within same system, i don't know, not even in guilded to know.
Maybe if you have a LAN network, you can try, but i highly doubt it'll work anyway
JET in another hand have servers for remote connections, yet those only rumours i heard.

Here's for Eresh(I bet she'll see this eventually):
You don't need those checks - (X !== Y) [if it's same - don't override it]
Because nothing would change, so why won't just not override in any case? [X = Y]
Except you want to add fancy Logger.log(); outs in server, not the case in your code, but i'll give you a tip, use 'try -catch'

Here, you know what to do with this.

DatabaseServer.tables.server.ip = Config.Server.ip
DatabaseServer.tables.server.port = Config.Server.port

You're welcome.
Turns out, server already writes the same thing into itself like this
Inside src/server/HttpServer.js.
It won't work neither if you try to change value into HttpConfig or in DatabaseServer.tables.server.

So i bet it's impossible to write that value onto launched server(Because loading queue), and should be written manually beforehand.

If it is possible:
You'd set your internal (not local) IP and any port in AkiConfig(If it worked) or in aki_data/database/server.json
I really don't know what you suppose to do with certificate, but i guess you need to make a folder in PC2, put a same certificate as server on PC1 has (it's in user/certs) and use windows utility to add it on PC2.

Open Command Prompt (Windows key + R)

inside of it enter : certutil.exe -f -addstore Root <yourgamepath>\user\certs\cert.pem
Here's an example if you feel you need one:
certutil.exe -f -addstore Root D:\Games\Tarkov\user\certs\cert.pem In our case you can use any folder..i guess? no one is really informative sadly.
Start the server on PC1 and try to connect via PC2.

Well, i also realised i was wrong in multiple aspects, here you go, more detailed guide:
1) Prepare a setup, Install SPT on PC1 (That means install EFT with AKI on it)
2) Install AKI on PC2, you don't need game files for that.
3) On PC2 - Change IP and Port, IP is your internal one, you can check it via Win-x > System>Network>Adapter>Settings>Status, something like that, i have a different default language so i can't tell you exact names.
And any port, there is no firewall really in LAN, just don't go above limits, take a simple one, like 3456 or 7777, you may leave it as it is
4) Launch server in PC2, take generated certs from PC2 and put it in PC1 into user/certs, or maybe any folder you'll use next step on. (that's where i was wrong on previous post)
5) Use certutil as guided above
6) Run Launcher on PC1, get in settings, set up your URL, launch the game.
If it's that perfect it'll work, maybe it's not, it's all my assumptions, i don't have 2nd pc as of now to try, sorry.
Maybe someone will give you more detailed instructions on back-end side.

It works just fine if you do it correctly.