standardized JAR naming to gittally.jar (version-free); updated scripts, docs, and build config to align; added --version support via BuildProperties

build.gradle.kts

@@ -9,7 +9,7 @@ plugins {
 }
 
 group = "de.hoennig"
-version = "0.1.0-SNAPSHOT"
+version = "0.9.0"
 
 java {
     toolchain {
@@ -63,6 +63,12 @@ springBoot {
     }
 }
 
+tasks.bootJar {
+    // version-free jar name, so docs and scripts never contain the version;
+    // the version itself stays available via BuildProperties (UI footer, --version)
+    archiveFileName = "gittally.jar"
+}
+
 kotlin {
     compilerOptions {
         freeCompilerArgs.addAll("-Xjsr305=strict")