Feature: CLI startup parameters (--host / --port / --profile) for launcher integration

[monil2233]

Summary

Add command-line startup parameters so an external launcher can start Genie with a connection and profile pre-filled, e.g.:

genie.exe --host=127.0.0.1 --port=8001 --profile=TysongDRF

This makes Genie a drop-in target for launcher workflows (e.g. Lich Launcher), where one tool handles all client launches and just hands each client its host/port/profile.

Use case

A user who manages everything through a single launcher wants to point it at genie.exe and pass the destination + profile, rather than launching Genie and clicking through the Connect dialog each time.

Proposed parameters

• --host=<hostname|ip> — game/proxy host to connect to
• --port=<port> — game/proxy port
• --profile=<name> — profile to load (settings, layout, per-character config)

All optional and combinable. Reasonable behavior when only some are supplied (e.g. --profile alone loads that profile and uses its stored connection; --host/--port alone connect ad-hoc).

Important constraint

This must launch the normal interactive UI — it is not a headless/daemon mode. The parameters only pre-fill and kick off the same connect path the Connect dialog uses; the window still comes up as usual.

Current state

Program.cs forwards process args straight to Avalonia's lifetime, and only Velopack consumes its own --veloapp-* args during install/update. There is no custom parsing of --host/--port/--profile today.

Acceptance criteria

• Parse --host, --port, --profile (and document accepted forms: --key=value)
• When supplied, pre-fill the connection/profile and begin connecting on startup
• Normal interactive window still launches (no headless path)
• Unknown/absent args are ignored gracefully (Velopack --veloapp-* handling unaffected)
• Brief docs note (README / Connecting wiki) on launcher integration

[mrhoribu]

These parameters would just bypasss Genie's login all together and open the UI connecting to the host:port with the profile given. No need for auth or anything as the host:port is already in an active connected state and just need to open Genie to attach to it.

[monil2233]

Shipped in alpha.3.4 — the app parses --host, --port, --profile, and --mode launch flags, so an external launcher can open Genie pre-attached to an already-connected host:port with a profile selected (no re-auth), matching the use case described above. Closing; reopen if the behavior differs from what you need.