chore(release): bump version to v3.13.0 and sync changelog/release notes

Backfill post-draft changes into CHANGELOG and three-language release
notes (en/zh/ja): 16 new Added entries, 6 Fixed entries, 1 Docs entry,
and updated header stats (139 commits, 280 files, +31627/-3042).

src-tauri/Cargo.lock

@@ -735,7 +735,7 @@ dependencies = [
 
 [[package]]
 name = "cc-switch"
-version = "3.12.3"
+version = "3.13.0"
 dependencies = [
  "anyhow",
  "arboard",

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cc-switch"
-version = "3.12.3"
+version = "3.13.0"
 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": "3.12.3",
+  "version": "3.13.0",
   "identifier": "com.ccswitch.desktop",
   "build": {
     "frontendDist": "../dist",