feat(web): add Privacy Policy and Terms of Service pages

- Create /chinh-sach-bao-mat (Privacy Policy) with 10 sections
- Create /dieu-khoan-su-dung (Terms of Service) with 11 sections
- Add legal link group to footer (vi + en i18n)
- Add legalLinks prop to Footer for bottom-bar display
- Wire links into public layout

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/messages/en.json

@@ -118,7 +118,10 @@
     "description": "Smart real estate platform in Vietnam",
     "propertyTypes": "Property types",
     "areas": "Areas",
-    "support": "Support"
+    "support": "Support",
+    "legal": "Legal",
+    "privacyPolicy": "Privacy Policy",
+    "termsOfService": "Terms of Service"
   },
   "propertyTypes": {
     "APARTMENT": "Apartment",