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.

src-tauri/Cargo.lock

@@ -735,7 +735,7 @@ dependencies = [
 
 [[package]]
 name = "cc-switch"
-version = "3.16.1"
+version = "3.16.2"
 dependencies = [
  "anyhow",
  "arboard",

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cc-switch"
-version = "3.16.1"
+version = "3.16.2"
 description = "All-in-One Assistant for Claude Code, Codex & Gemini CLI"
 authors = ["Jason Young"]
 license = "MIT"

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "CC Switch",
-  "version": "3.16.1",
+  "version": "3.16.2",
   "identifier": "com.ccswitch.desktop",
   "build": {
     "frontendDist": "../dist",