feat(branding): add 3D shield logo, embed Windows PE icon, and update README banner

build.rs

@@ -0,0 +1,28 @@
+fn main() {
+    println!("cargo:rerun-if-changed=assets/icon.ico");
+    println!("cargo:rerun-if-changed=build.rs");
+
+    let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
+    if target_os == "windows" {
+        let out_dir = std::env::var("OUT_DIR").unwrap();
+        let rc_path = format!("{}/sanctum.rc", out_dir);
+        let res_path = format!("{}/sanctum.res", out_dir);
+
+        let manifest_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+        let ico_path = format!("{}/assets/icon.ico", manifest_dir).replace('\\', "/");
+
+        if std::path::Path::new(&ico_path).exists() {
+            let rc_content = format!("1 ICON \"{}\"\n", ico_path);
+            if std::fs::write(&rc_path, rc_content).is_ok() {
+                let status = std::process::Command::new("windres")
+                    .args(["-i", &rc_path, "-O", "coff", "-o", &res_path])
+                    .status();
+                if let Ok(s) = status {
+                    if s.success() {
+                        println!("cargo:rustc-link-arg={}", res_path);
+                    }
+                }
+            }
+        }
+    }
+}