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.

.github/workflows/docker.yml

@@ -11,7 +11,7 @@ on:
       image_tag:
         description: 'Tag for this image build'
         type: string
-        default: 'v2.6.4'
+        default: 'v2.7.0'
         required: true
       mark_latest:
         description: 'Mark this image as latest'

.github/workflows/release.yml

@@ -18,7 +18,7 @@ on:
       version:
         description: 'Version for this release'
         type: string
-        default: 'v2.6.4'
+        default: 'v2.7.0'
         required: true
       make_latest:
         description: 'Mark this release as latest'