rename: cloud-installer → cloud-sync

'installer' implied one-way install (matching packwiz-installer); this
tool is bidirectional sync (pull on launch, push on exit). Aligns with
the existing automc <scope>-<role> pattern: cloud-svc ↔ cloud-sync,
matching mc-router, mc-wrapper, gate-waker.

Gitea repo renamed via API (id 2974 preserved); jar filename now
cloud-sync-<version>.jar. Build verified post-rename.

build.gradle.kts

@@ -48,7 +48,7 @@ tasks.test {
 }
 
 tasks.shadowJar {
-    archiveBaseName.set("cloud-installer")
+    archiveBaseName.set("cloud-sync")
     archiveClassifier.set("")
     archiveVersion.set(project.version.toString())
     mergeServiceFiles()