feat: Deduplicates spawns. Adds spawnbounds where needed. (#2299)

### Summary

- Add z-restricted spawnBounds to 35 spawners across 15 files to prevent creatures from spawning on incorrect floors
- Building spawners (Pyramid, Fire dungeon, Shame, Vendors) use minZ = spawner_z to prevent spawning below
- Ground level spawners (Graveyards, Outdoors, Tokuno) use minZ = -128 for natural terrain variation
- Multi-floor structures in Ilshenar use floor-specific Z restrictions

### Test plan

- Verify spawners in Fire dungeon building don't spawn creatures on floors below
- Verify Pyramid spawners keep creatures on their respective levels
- Verify ground level spawners (graveyards, outdoors) still spawn correctly on terrain
- Check Ilshenar multi-floor structure spawns creatures on correct floors

Distribution/Data/Spawns/shared/malas/South.json

@@ -0,0 +1,22 @@
+[
+  {
+    "type": "Spawner",
+    "guid": "6bbb82e4-b0d1-4a23-a9da-5d35911ce762",
+    "name": "Spawner (404)",
+    "location": [2231, 1605, -95],
+    "map": "Malas",
+    "count": 33,
+    "minDelay": "00:05:00",
+    "maxDelay": "00:10:00",
+    "team": 0,
+    "homeRange": 160,
+    "walkingRange": 160,
+    "entries": [
+      { "name": "Mongbat", "maxCount": 7, "probability": 100 },
+      { "name": "SandVortex", "maxCount": 6, "probability": 100 },
+      { "name": "Scorpion", "maxCount": 7, "probability": 100 },
+      { "name": "Snake", "maxCount": 6, "probability": 100 },
+      { "name": "Spectre", "maxCount": 7, "probability": 100 }
+    ]
+  }
+]