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>

worker/package.json

@@ -1,6 +1,6 @@
 {
   "name": "cloudflare_temp_email",
-  "version": "1.6.0",
+  "version": "1.7.0",
   "private": true,
   "type": "module",
   "scripts": {
@@ -11,13 +11,13 @@
     "build": "wrangler deploy --dry-run --outdir dist --minify"
   },
   "devDependencies": {
-    "@cloudflare/workers-types": "^4.20260411.1",
+    "@cloudflare/workers-types": "^4.20260414.1",
     "@eslint/js": "9.39.1",
     "@types/node": "^25.6.0",
     "eslint": "9.39.1",
     "globals": "^16.5.0",
-    "typescript-eslint": "^8.58.1",
-    "wrangler": "^4.81.1"
+    "typescript-eslint": "^8.58.2",
+    "wrangler": "^4.82.2"
   },
   "dependencies": {
     "@aws-sdk/client-s3": "3.888.0",
@@ -27,7 +27,7 @@
     "jsonpath-plus": "^10.4.0",
     "mimetext": "^3.0.28",
     "postal-mime": "^2.7.4",
-    "resend": "^6.10.0",
+    "resend": "^6.11.0",
     "telegraf": "4.16.3",
     "worker-mailer": "^1.2.1"
   },