style(hook): clippy -D warnings clean on default + fifa17 features

Modernize manual nul-terminated byte strings to C-string literals (c"...")
at all Win32 GetModuleHandleA/GetProcAddress/getaddrinfo call sites (byte-identical),
drop two redundant SOL_SOCKET-as-i32 casts, remove a needless return in the fifa17
install path, and add a # Safety section to DllMain. Scope the FIFA-23-path
dead-code/unused-import lints (unused only under the fifa17 feature, stripped by the
linker) with a documented crate-level cfg_attr allow. Cross-verified: both the
default and fifa17 builds now pass clippy -D warnings and compile; probe and
capture_baseline still build.

openfut-hook/src/sbc_hook.rs

@@ -313,12 +313,12 @@ unsafe fn read_u16(ptr: usize) -> Option<u16> {
 /// Resolve CardsDLL's runtime base, or 0. Tries the exact loaded name; the ToolHelp
 /// fallback (name-contains "CardsDLL") lives in the spec — add it if EA ever renames.
 unsafe fn resolve_cards_base() -> usize {
-    let h = GetModuleHandleA(b"CardsDLL_Win64_retail.dll\0".as_ptr());
+    let h = GetModuleHandleA(c"CardsDLL_Win64_retail.dll".as_ptr().cast());
     if !h.is_null() {
         return h as usize;
     }
     // Also try the short form some tooling reports.
-    let h2 = GetModuleHandleA(b"CardsDLL.dll\0".as_ptr());
+    let h2 = GetModuleHandleA(c"CardsDLL.dll".as_ptr().cast());
     if !h2.is_null() {
         return h2 as usize;
     }