chore(#30): set Offband version baseline 1.1.0+15

Replace inherited zjs81 9.1.0+14 with Offband's own line. Milestone catch-up: v1.0.0=rebrand (c002f90), v1.1.0=settings shell. Build number 14->15 (monotonic). Tags applied separately on dev.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 9.1.0+14
+version: 1.1.0+15
 
 environment:
   sdk: ^3.9.2