Release v0.2.0

Bump version to 0.2.0 across package.json, tauri.conf.json and Cargo.toml.
First signed release published to Gitea (tags v0.2.0 + updater/latest.json);
auto-updater endpoint verified live.

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

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "exbyte-depot",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "identifier": "com.bonchellon.exbyte-depot",
   "build": {
     "beforeDevCommand": "npm run dev",