Refactor: remove desktop/Tauri bundle, add i18n, CI/CD pipeline

- Remove desktop (Tauri) bundle: docs/desktop.md, icons/, tauri.conf.json,
  src/desktop/mod.rs, gen/schemas/
- Remove build.rs (no longer needed)
- Add i18n system (crates/core-api, plugin-mobile-connector, web)
- Refactor config system (src/config.rs, boot_format.rs)
- Add mobile connector features (app, router, device pairing)
- Plugin system improvements (skald-core)
- Update dependencies (Cargo.lock, Cargo.toml)
- CI/CD: Gitea Actions workflows (nightly + release), package.sh,
  verify-version.sh, builds.skaldagent.net config

crates/plugin-mobile-connector/src/lib.rs

@@ -31,6 +31,7 @@ mod agent;
 mod app;
 mod auth;
 mod events;
+mod i18n;
 mod notifier;
 mod payloads;
 mod proxy;
@@ -140,6 +141,7 @@ impl MobileConnectorPlugin {
             Arc::clone(&client),
             Arc::clone(&ctx.user_channel),
             Arc::clone(&ctx.config),
+            Arc::clone(&ctx.i18n),
             bindings,
             require_device_confirmation,
             notify_delay,
@@ -339,6 +341,12 @@ impl Plugin for MobileConnectorPlugin {
         crate::tools::mobile_tools(self)
     }
 
+    /// Backend translation tables — the router's error/response strings,
+    /// namespaced `plugin.mobile-connector.*`. See `crate::i18n`.
+    fn i18n(&self) -> Vec<core_api::i18n::LocaleBundle> {
+        crate::i18n::bundles()
+    }
+
     fn as_any(&self) -> &dyn std::any::Any { self }
     fn as_arc_any(self: Arc<Self>) -> Arc<dyn std::any::Any + Send + Sync> { self }
 }