Integrate v3 master: residence and health cluster (Batch 1)

Rewrites the six residence/health pages (visa-and-residence-explained,
student-residence-permit, where-to-apply-for-residence,
means-accommodation-address, rm-si-3-health-insurance,
healthcare-in-slovenia) to the deeper v3 English master, trilingual.
Adds backward-compatible generator support for per-page hero-image
placeholders and a "Sources and further information" section, plus
.guide-last-checked styling. Owner decisions applied (student work on
the study permit vs employment permit; sufficient means shown as
"check current"). SI/MK bodies are MSOS working translations pending
native proofread.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

css/pages/_guide.css

@@ -282,6 +282,12 @@
     color: #344054;
     font-weight: 500;
 }
+.guide-last-checked {
+    margin-top: 10px;
+    font-size: 14px;
+    color: #667085;
+    font-style: italic;
+}
 .guide-hero-image {
     max-width: 960px;
     margin: 28px auto 24px;