feat: add html-to-image tool definition and i18n strings

Add tool metadata to shared constants and i18n entries across all 21
locales for the new HTML to Image screenshot tool.

packages/shared/src/constants.ts

@@ -347,6 +347,14 @@ export const TOOLS: Tool[] = [
     icon: "QrCode",
     route: "/qr-generate",
   },
+  {
+    id: "html-to-image",
+    name: "HTML to Image",
+    description: "Capture webpages as high-quality images",
+    category: "utilities",
+    icon: "Globe",
+    route: "/html-to-image",
+  },
   {
     id: "barcode-read",
     name: "Barcode Reader",