chore: upgrade dependencies and bump version to v1.7.0 (#982)

- Upgrade deps across frontend/worker/pages/vitepress-docs (wrangler 4.82.2, dompurify 3.4.0, resend 6.11.0, etc.)
- Bump version to v1.7.0 in all package.json and worker constants
- Add v1.7.0 CHANGELOG placeholder; move #978/#930 Bug Fixes from v1.6.0 to v1.7.0 (merged after v1.6.0 tag)
- Add upgrade-dependencies skill; translate version-upgrade skill to English

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "cloudflare_temp_email",
-  "version": "1.6.0",
+  "version": "1.7.0",
   "private": true,
   "type": "module",
   "scripts": {
@@ -29,7 +29,7 @@
     "@wangeditor/editor": "^5.1.23",
     "@wangeditor/editor-for-vue": "^5.1.12",
     "axios": "^1.15.0",
-    "dompurify": "^3.3.3",
+    "dompurify": "^3.4.0",
     "jszip": "^3.10.1",
     "mail-parser-wasm": "^0.2.2",
     "naive-ui": "^2.44.1",
@@ -43,7 +43,7 @@
   "devDependencies": {
     "@vicons/fa": "^0.13.0",
     "@vicons/material": "^0.13.0",
-    "@vitejs/plugin-vue": "^6.0.5",
+    "@vitejs/plugin-vue": "^6.0.6",
     "jsdom": "^28.1.0",
     "unplugin-auto-import": "^20.3.0",
     "unplugin-vue-components": "^30.0.0",
@@ -53,7 +53,7 @@
     "vitest": "^3.2.4",
     "workbox-build": "^7.4.0",
     "workbox-window": "^7.4.0",
-    "wrangler": "^4.81.1"
+    "wrangler": "^4.82.2"
   },
   "packageManager": "pnpm@10.10.0+sha512.d615db246fe70f25dcfea6d8d73dee782ce23e2245e3c4f6f888249fb568149318637dca73c2c5c8ef2a4ca0d5657fb9567188bfab47f566d1ee6ce987815c39"
 }