chore: bump version to 1.7.116-alpha + changelog/What's New

Bundles all post-115 fixes into an OTA release: boot READY-before-recovery
+ Restart=always (no more 'server starting up'), and the app-install
daemon-kill fix (v6 relay only bridges live app ports; port-cleanup
excludes our own PID).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/Cargo.lock

@@ -95,7 +95,7 @@ dependencies = [
 
 [[package]]
 name = "archipelago"
-version = "1.7.115-alpha"
+version = "1.7.116-alpha"
 dependencies = [
  "anyhow",
  "archipelago-container",