Add coordinate json file

webxr-cube/public/coordinate/pois.json

+[
+  {
+    "id": "bau-2-bibliothek",
+    "name": "Bau 2 — Bibliothek",
+    "lat": 48.7798869687049,
+    "lon": 9.17358439772658,
+    "category": ["library"],
+    "icon": "📚",
+    "entrance": null,
+    "waypoints": [],
+    "description": "University library located in Bau 2. A quiet place for study and group work."
+  },
+  {
+    "id": "bau-1-student-service-cafeteria",
+    "name": "Bau 1 — Student Service & Cafeteria",
+    "lat": 48.780470224654096,
+    "lon": 9.172801487746531,
+    "category": ["student_services", "cafeteria"],
+    "icon": "🎓",
+    "entrance": { "lat": 48.780480224654096, "lon": 9.172821487746531 },
+    "waypoints": [],
+    "description": "Bau 1 hosts the Student Service (2nd floor) and the main cafeteria."
+  },
+  {
+    "id": "bridge-block-4",
+    "name": "Bridge — Block 4",
+    "lat": 48.780314078060975,
+    "lon": 9.172559877534384,
+    "category": ["bridge", "wayfinding"],
+    "icon": "🌉",
+    "entrance": null,
+    "waypoints": [],
+    "description": "Pedestrian bridge connecting several campus blocks, close to Block 4."
+  },
+  {
+    "id": "bau-8-hft-cafe",
+    "name": "Bau 8 — HFT Café",
+    "lat": 48.78005045872437,
+    "lon": 9.171181620129653,
+    "category": ["cafe"],
+    "icon": "☕",
+    "entrance": { "lat": 48.7800602, "lon": 9.1711501 },
+    "waypoints": [
+      { "lat": 48.780314078060975, "lon": 9.172559877534384 }
+    ],
+    "description": "Small café in Bau 8 — perfect for a quick coffee or snack between classes."
+  }
+]