Add full ITINERARY.md with ferry times and driving suggestions

- New ITINERARY.md: complete day-by-day from Aug 4 Walldorf to Sep 2 home.
  Includes exact ferry departure/arrival times for all 4 crossings,
  recommended hotel departure times on driving days, timed daily schedules.
  Key findings: IoM→Larne (not Belfast) every 2-3 days, Aug 10 sailing fits;
  Galway→Dingle via Killimer-Tarbert car ferry saves 90km vs Limerick.
- IoM restored to 3 nights (Aug 7-10) to fit ferry schedule
- Belfast updated: arrival from Larne, not Belfast direct
- All section dates corrected; README updated with ITINERARY.md link

locations/04-isle-of-man.md

@@ -1,8 +1,8 @@
 # Isle of Man
 
 > **Type:** Island destination
-> **Dates:** ~Aug 7–9 (2 nights — leaving 1 day for Wicklow later)
-> **Recommended stay:** 2–3 nights
+> **Dates:** ~Aug 7–10 (3 nights — ferry to Larne Aug 10)
+> **Recommended stay:** 3 nights
 > **Best for:** Coastal roads, castles, TT culture, Celtic heritage
 
 ## Why Visit