feat(site): overhaul domain and monitor detail views

Refactor the domain and monitor detail pages to use a new modular
component architecture. This includes:

- Implementing `domain-info-sections.tsx` and `monitor-info-sections.tsx`
  to provide structured, card-based information layouts.
- Enhancing domain details with new sections for DNS, SSL, SEO, and
  hosting information.
- Improving monitor details with enhanced uptime visualizations and
  response time statistics.
- Updating the PageSpeed check API to support an optional API key from
  environment variables.
- Cleaning up UI components and improving code formatting in the
  monitors table.
- Updating localization files to support new UI strings.

internal/site/src/locales/ja/ja.po

@@ -1830,6 +1830,10 @@ msgstr "解決済み"
 msgid "Response"
 msgstr ""
 
+#: src/components/routes/monitor.tsx
+msgid "Response time over the selected period"
+msgstr ""
+
 #: src/components/routes/monitor.tsx
 #~ msgid "Response Times"
 #~ msgstr ""
@@ -2041,8 +2045,8 @@ msgid "Status"
 msgstr "ステータス"
 
 #: src/components/routes/monitor.tsx
-msgid "Status and response time over the selected period"
-msgstr ""
+#~ msgid "Status and response time over the selected period"
+#~ msgstr ""
 
 #: src/components/routes/status-pages.tsx
 msgid "Status Page Manager"