feat(launcher): native Windows support

Port the egui launcher to run natively on Windows (no Wine/Proton). The GUI,
launch state machine, config, health/account monitors, and openfut.cfg writing
are unchanged and cross-platform; only the effect layer is branched:

- game_launch: cfg(windows) launch spawns the game executable directly with its
  working dir (the version.dll hijack loads from the game dir; no WINEDLLOVERRIDES,
  Wine prefix, or licence regen). Requires the launcher to run elevated so the
  child inherits admin. Linux Proton path gated cfg(unix).
- arm: cfg(windows) is a no-op (routing is openfut.cfg, written by the client-files
  step; no ptrace_scope/DNAT/hosts). Linux arming gated cfg(unix).
- local_services: on Windows LSX/autopatch are in-process (stp-origin_emu.dll +
  version.dll hook), so ensure_running reports ready without spawning. Gated the
  unix-only CommandExt/process_group.
- preflight: cfg(windows) run() keeps only backend-reachable + hook-config checks.
- config: GameProfile configured()/validate() accept a runner-less Windows profile.

theme: fix a latent cross-platform panic — egui 0.29 keeps a Style per theme, so
set_style only reached the active one and TextStyle::resolve("Hero") panicked when
the other theme rendered. Install the full style into both themes and pin Dark.

Cross-built for x86_64-pc-windows-gnu; Linux build + 75 tests unchanged.

src/theme.rs

@@ -299,5 +299,13 @@ fn install_style(ctx: &Context) {
     v.widgets.open.rounding = radius;
 
     style.visuals = v;
-    ctx.set_style(style);
+    // egui 0.29 keeps a separate `Style` per theme (dark/light) and renders with
+    // whichever the theme preference resolves to. `set_style` touches only the
+    // currently-active theme, so a later switch to the other one would drop our
+    // named text styles ("Hero", "Subheading", …) and panic in `TextStyle::resolve`.
+    // Install the full style into BOTH themes and pin the preference to Dark so
+    // the branded look is stable regardless of the host's system theme.
+    ctx.set_style_of(egui::Theme::Dark, style.clone());
+    ctx.set_style_of(egui::Theme::Light, style);
+    ctx.set_theme(egui::ThemePreference::Dark);
 }