chore(release): prepare v3.16.2

Add the v3.16.2 CHANGELOG entry covering the 41 commits since v3.16.1,
bump the version across package.json, tauri.conf.json, Cargo.toml, and
Cargo.lock, and add trilingual (zh/en/ja) release notes.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cc-switch",
-  "version": "3.16.1",
+  "version": "3.16.2",
   "description": "All-in-One Assistant for Claude Code, Codex & Gemini CLI",
   "type": "module",
   "scripts": {