chore: bump version to 1.0.0 and update release metadata

Update package references from RC/preview versions to stable 1.0.* across all templates and project files. Mark RC1 roadmap as completed and update documentation to reflect v1.0.0 release. Add GestureManager cleanup in SkiaView.Dispose() to prevent memory leaks. Update copyright years to 2025-2026 and add development artifacts to .gitignore.

docs/RC1-ROADMAP.md

@@ -1,8 +1,10 @@
-# OpenMaui Linux - RC1 Roadmap
+# OpenMaui Linux - RC1 Roadmap (Completed)
 
 ## Goal
 Achieve Release Candidate 1 with full XAML support, data binding, and stable controls.
 
+> **Status: All phases completed. Released as v1.0.0.**
+
 ---
 
 ## Phase 1: BindableProperty Foundation
@@ -228,7 +230,8 @@ Achieve Release Candidate 1 with full XAML support, data binding, and stable con
 
 ## Version Target
 
-- Current: v1.0.0-preview.4
-- After Phase 1-2: v1.0.0-preview.5
-- After Phase 3-4: v1.0.0-preview.6
-- After Phase 5-6: v1.0.0-rc.1
+- ~~Current: v1.0.0-preview.4~~
+- ~~After Phase 1-2: v1.0.0-preview.5~~
+- ~~After Phase 3-4: v1.0.0-preview.6~~
+- ~~After Phase 5-6: v1.0.0-rc.1~~
+- **Released: v1.0.0**