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/i18n.rs

@@ -0,0 +1,35 @@
+//! Backend translation bundles for the mobile-connector.
+//!
+//! These are the plugin's **backend** strings — the error/response text its
+//! router returns, resolved to the caller's language via `PluginContext.i18n`
+//! (see `core_api::i18n`). The frontend fragment's UI strings live separately in
+//! `web/i18n.js` (registered client-side); the two sets barely overlap, so each
+//! side owns its own table rather than sharing one over an endpoint.
+//!
+//! The tables ship as JSON embedded at compile time — one file per locale, keys
+//! namespaced `plugin.mobile-connector.*`. A malformed file is skipped (its
+//! locale simply falls back to English) rather than failing the build path.
+
+use std::collections::HashMap;
+
+use core_api::i18n::LocaleBundle;
+
+/// Every locale bundle this plugin contributes, parsed from the embedded JSON.
+pub fn bundles() -> Vec<LocaleBundle> {
+    [
+        ("en", include_str!("../i18n/en.json")),
+        ("it", include_str!("../i18n/it.json")),
+        ("fr", include_str!("../i18n/fr.json")),
+    ]
+    .into_iter()
+    .filter_map(|(locale, raw)| {
+        match serde_json::from_str::<HashMap<String, String>>(raw) {
+            Ok(strings) => Some(LocaleBundle::new(locale, strings)),
+            Err(e) => {
+                tracing::warn!(locale, error = %e, "mobile-connector i18n bundle failed to parse");
+                None
+            }
+        }
+    })
+    .collect()
+}