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.

Cargo.lock

@@ -2259,7 +2259,7 @@ checksum = "d0881ea181b1df73ff77ffaaf9c7544ecc11e82fba9b5f27b262a3c73a332555"
 
 [[package]]
 name = "easytier"
-version = "2.6.4"
+version = "2.7.0"
 dependencies = [
  "anyhow",
  "arc-swap",
@@ -2396,7 +2396,7 @@ dependencies = [
 
 [[package]]
 name = "easytier-core"
-version = "2.6.4"
+version = "2.7.0"
 dependencies = [
  "aes-gcm",
  "anyhow",
@@ -2480,7 +2480,7 @@ dependencies = [
 
 [[package]]
 name = "easytier-gui"
-version = "2.6.4"
+version = "2.7.0"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -2527,7 +2527,7 @@ dependencies = [
 
 [[package]]
 name = "easytier-mini"
-version = "2.6.4"
+version = "2.7.0"
 dependencies = [
  "anyhow",
  "easytier",
@@ -2536,7 +2536,7 @@ dependencies = [
 
 [[package]]
 name = "easytier-proto"
-version = "2.6.4"
+version = "2.7.0"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -2609,7 +2609,7 @@ dependencies = [
 
 [[package]]
 name = "easytier-web"
-version = "2.6.4"
+version = "2.7.0"
 dependencies = [
  "anyhow",
  "async-trait",