feat(web): add auth+search i18n translations and filter-bar accessibility

Add missing auth and search translation namespaces to vi.json and en.json
that are required by login/register pages and search filter-bar component.
Update filter-bar with useTranslations('search'), aria-labels, and
role="search" for WCAG 2.1 AA compliance.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/messages/en.json

@@ -106,5 +106,62 @@
     "label": "Language",
     "vi": "Tiếng Việt",
     "en": "English"
+  },
+  "auth": {
+    "loginTitle": "Login",
+    "loginDescription": "Enter your phone number and password to log in",
+    "phone": "Phone number",
+    "phonePlaceholder": "0912345678",
+    "password": "Password",
+    "passwordPlaceholder": "Enter password",
+    "showPassword": "Show",
+    "hidePassword": "Hide",
+    "loginButton": "Login",
+    "orLoginWith": "Or login with",
+    "noAccount": "Don't have an account?",
+    "registerLink": "Register",
+    "dismiss": "Dismiss",
+    "registerTitle": "Register",
+    "registerDescription": "Create a new account to start using GoodGo",
+    "fullName": "Full name",
+    "fullNamePlaceholder": "John Doe",
+    "email": "Email",
+    "emailPlaceholder": "email@example.com",
+    "confirmPassword": "Confirm password",
+    "confirmPasswordPlaceholder": "Re-enter password",
+    "registerButton": "Register",
+    "hasAccount": "Already have an account?",
+    "loginLink": "Login",
+    "orRegisterWith": "Or register with",
+    "oauthErrors": {
+      "oauth_failed": "Social login failed. Please try again.",
+      "access_denied": "You denied access. Please try again.",
+      "invalid_request": "Invalid login request. Please try again.",
+      "server_error": "Server error. Please try again later.",
+      "temporarily_unavailable": "Service temporarily unavailable. Please try again later.",
+      "default": "An error occurred during login. Please try again."
+    }
+  },
+  "search": {
+    "filters": "Filters",
+    "allTransactions": "All transactions",
+    "allPropertyTypes": "All property types",
+    "allAreas": "All areas",
+    "allPrices": "All prices",
+    "bedrooms": "Bedrooms",
+    "bedroomsCount": "{count}+ BR",
+    "areaLabel": "Area (m²)",
+    "areaFrom": "From",
+    "areaTo": "To",
+    "district": "District",
+    "searchButton": "Search",
+    "priceRanges": {
+      "under1b": "Under 1 billion",
+      "1to3b": "1 - 3 billion",
+      "3to5b": "3 - 5 billion",
+      "5to10b": "5 - 10 billion",
+      "10to20b": "10 - 20 billion",
+      "over20b": "Over 20 billion"
+    }
   }
 }