chore: bump version to 2.7.0 (#2566)

* chore: bump version to 2.7.0

Update version strings across the workspace:
- crate versions and internal dependency requirements for
  easytier, easytier-core, easytier-proto, easytier-web,
  easytier-gui, and easytier-mini, plus Cargo.lock
- GUI package.json and tauri.conf.json
- Magisk module.prop
- default release/docker workflow tags (v2.7.0)

* fix(ohos): sync easytier-ohrs Cargo.lock with bumped workspace versions

The ohos workflow builds easytier-ohrs with --locked, so its
lockfile must record the new 2.7.0 versions of the easytier,
easytier-core, and easytier-proto path dependencies.

easytier-core/Cargo.toml

@@ -3,7 +3,7 @@ name = "easytier-core"
 description = "EasyTier OS-free control-plane core primitives."
 homepage = "https://github.com/EasyTier/EasyTier"
 repository = "https://github.com/EasyTier/EasyTier"
-version = "2.6.4"
+version = "2.7.0"
 edition.workspace = true
 rust-version.workspace = true
 authors = ["kkrainbow"]