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/skald-core/src/skald/bundles.rs

@@ -113,7 +113,8 @@ impl Media {
         ).await?;
         // Evaluate the await outside the `info!` macro: leaving the temporary
         // `tracing::Value` from the field expression alive across the await
-        // makes the surrounding future non-Send, which Tauri's runtime rejects.
+        // makes the surrounding future non-Send, which the multi-threaded
+        // runtime rejects.
         let image_generator_models = image_generator_manager.list_models_info().await.len();
         info!(
             db_backed = image_generator_models,