Make HTTP server host configurable to support dedicated servers/VPS

[Copilot]

The HTTP server host was hardcoded to 127.0.0.1, making the API inaccessible from outside localhost — unusable on dedicated servers or VPS environments.

Changes

• config.yml — adds host field (default 0.0.0.0) with inline comments explaining 0.0.0.0 vs 127.0.0.1
• CommandApiPlugin.kt — reads host from config instead of hardcoding; falls back to 0.0.0.0 if unset; reflects actual host in startup log

# Use "0.0.0.0" to listen on all interfaces (required for dedicated servers / VPS).
# Use "127.0.0.1" to restrict access to localhost only.
host: "0.0.0.0"

Security note: With 0.0.0.0, the API is publicly reachable — ensure api-key is strong and consider firewall rules to restrict access to trusted IPs.

[Copilot]

Pull request overview

Makes the embedded Ktor HTTP server bind address configurable (instead of hardcoded localhost) so the API can be reachable when running on dedicated servers/VPS.

Changes:

• Added host to config.yml (default 0.0.0.0) with explanatory comments.
• Updated CommandApiPlugin to read host from config and use it when starting the Netty server.
• Updated startup log to print the configured host.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/main/resources/config.yml	Adds host setting and guidance for binding to all interfaces vs localhost.
src/main/kotlin/com/sentrysmp/CommandApiPlugin.kt	Uses configured host for embeddedServer(...) and logs the chosen bind address.

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