initial commit: reforgermods.net launcher 0.1.0

A desktop server browser for Arma Reforger, built on the reforgermods.net v2
API. Live server list with search, sort and filters; a detail inspector with
population history and mod readiness; measured ICMP latency; favorites, recents
and settings; and direct joining through Steam.

Tauri 2 and Rust, with a Preact frontend that builds to 80 KB of JavaScript in
one chunk. Logic lives in rfm-core, which has no Tauri dependency and is tested
directly; src-tauri is the window, the command surface and the wiring.

Packaged for the public beta: a per-user NSIS installer, a portable .exe and an
Arch package, with signature-verified background updates on Windows and a
release pipeline that builds from a tag. The artifacts are not yet
Authenticode-signed — that is wired and waiting on an Azure Trusted Signing
identity, and docs/distribution.md says so plainly rather than letting anyone
discover it at the SmartScreen dialog.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

crates/rfm-core/src/lib.rs

@@ -0,0 +1,25 @@
+//! Core logic for the reforgermods.net launcher.
+//!
+//! This crate deliberately has no Tauri dependency. Everything that can be
+//! decided without a window lives here so it can be unit-tested directly:
+//! the reforgermods.net API client, Steam launch-URI construction, local
+//! persistence, response caching, and local Workshop addon detection.
+
+pub mod api;
+pub mod cache;
+pub mod identity;
+pub mod launch;
+pub mod modscan;
+pub mod ping;
+pub mod presence;
+pub mod readiness;
+pub mod store;
+
+pub use api::{ApiClient, ApiError};
+pub use launch::{reforger_join_uri, steam_join_uri, LaunchError, ServerId};
+
+/// User-Agent the launcher identifies itself with. The launcher is a public,
+/// untrusted client: it sends no credentials, only this.
+pub fn user_agent() -> String {
+    format!("reforgermods.net-launcher/{}", env!("CARGO_PKG_VERSION"))
+}