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/Cargo.toml

@@ -6,9 +6,9 @@ edition = "2024"
 # The headless application core: database + crypto + identity, the LLM stack,
 # tools, MCP, plugins-as-a-registry, sessions.
 #
-# Deliberately knows nothing about the process shell around it. No Tauri, no
-# concrete plugin crates (it only ever sees `Arc<dyn Plugin>` from `core-api`),
-# no `axum` server — `skald` and `skald-setup` are both consumers.
+# Deliberately knows nothing about the process shell around it. No concrete
+# plugin crates (it only ever sees `Arc<dyn Plugin>` from `core-api`), no `axum`
+# server — `skald` and `skald-setup` are both consumers.
 
 [dependencies]
 axum = { version = "0.8", features = ["ws", "multipart"] }