feat: replace hosts file with DLL injection hook

Adds openfut-hook/, a Windows DLL (cdylib, x86_64-pc-windows-gnu) that
patches the IAT of FIFA 23 at load time to redirect getaddrinfo calls
for fut.ea.com / utas.*.fut.ea.com to 127.0.0.1, sending all FUT
traffic to the local bridge — no /etc/hosts changes needed.

Deployment: the launcher copies openfut_hook.dll into the FIFA 23 game
folder as version.dll (a DLL FIFA loads but delegates to system).
Proton picks up the local copy automatically when you set:
  WINEDLLOVERRIDES="version=n,b" %command%
in Steam launch options.

Also updates cert install to try the Wine/Proton cert store (wine
certutil) before falling back to the Linux system CA store, and removes
all hosts file code from setup.rs / app.rs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

openfut-hook/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "openfut-hook"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+windows-sys = { version = "0.59", features = [
+    "Win32_Foundation",
+    "Win32_System_LibraryLoader",
+    "Win32_System_Memory",
+    "Win32_System_SystemServices",
+    "Win32_Networking_WinSock",
+] }
+
+[profile.release]
+opt-level = "s"
+strip = true
+panic = "abort"