Release: v0.2.1 - testing module, UI auto-update, camera inversion test

- Register modules/testing submodule (zelara-ai/testing)
- Update apps/desktop: Tauri event-based device-linked UI auto-update + image-inversion-result event
- Update apps/mobile: real camera capture in testing screen (replaces hardcoded pixel)
- Update wikis: v0.2.0-test + v0.2.1 documentation

Author: arudaev

.gitmodules

@@ -16,3 +16,6 @@
 [submodule "modules/green"]
 	path = modules/green
 	url = https://github.com/zelara-ai/module-green.git
+[submodule "modules/testing"]
+	path = modules/testing
+	url = https://github.com/zelara-ai/testing.git