Build offline OpenPrestige release bundles

Rename the injector and package it with an embedded payload for Windows, Linux, and macOS x64/ARM64. Add a core-only ImGui native build, multi-platform CI and release packaging, and shared per-user storage with legacy config migration.

injector/crates/loader/build.rs

@@ -10,7 +10,10 @@ fn main() {
         Err(_) => newest_remapped_jar(),
     };
     if !jar.is_file() {
-        panic!("payload jar not found: {} (run `gradlew remapJar` or set PRESTIGE_PAYLOAD)", jar.display());
+        panic!(
+            "payload jar not found: {} (run `gradlew remapJar` or set PRESTIGE_PAYLOAD)",
+            jar.display()
+        );
     }
     println!("cargo:rerun-if-changed={}", jar.display());
     println!("cargo:rustc-env=PRESTIGE_PAYLOAD_JAR={}", jar.display());
@@ -22,14 +25,22 @@ fn newest_remapped_jar() -> PathBuf {
     if let Ok(entries) = fs::read_dir(&libs) {
         for entry in entries.flatten() {
             let name = entry.file_name().to_string_lossy().to_string();
-            if !name.starts_with("prestige-") || !name.ends_with(".jar") || name.ends_with("-dev.jar") || name.ends_with("-sources.jar") {
+            if !name.starts_with("prestige-")
+                || !name.ends_with(".jar")
+                || name.ends_with("-dev.jar")
+                || name.ends_with("-sources.jar")
+            {
                 continue;
             }
-            let time = entry.metadata().and_then(|m| m.modified()).unwrap_or(std::time::UNIX_EPOCH);
+            let time = entry
+                .metadata()
+                .and_then(|m| m.modified())
+                .unwrap_or(std::time::UNIX_EPOCH);
             if best.as_ref().map_or(true, |(t, _)| time > *t) {
                 best = Some((time, entry.path()));
             }
         }
     }
-    best.map(|(_, p)| p).unwrap_or_else(|| libs.join("prestige-0.1.0.jar"))
+    best.map(|(_, p)| p)
+        .unwrap_or_else(|| libs.join("prestige-0.1.0.jar"))
 }