feat(camping): add craftable tent and hammock addon

Tent pitches over a 2x3 flat footprint and lets players skip to dawn
without touching their spawn point. Hammock strings between two posts
3-6 blocks apart (straight or diagonal, +/-1 block height) and keeps
hostile mobs at bay while occupied. Both are craftable (wool/sticks and
wool/string) and mounted in all four worlds.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

camping-supplies-addon/camping_supplies_BP/recipes/hammock.json

@@ -0,0 +1,22 @@
+{
+  "format_version": "1.21.0",
+  "minecraft:recipe_shaped": {
+    "description": {
+      "identifier": "silverlabs:hammock_recipe"
+    },
+    "tags": ["crafting_table"],
+    "unlock": { "context": "AlwaysUnlocked" },
+    "pattern": [
+      "T   T",
+      "TWWWT"
+    ],
+    "key": {
+      "W": { "item": "minecraft:white_wool" },
+      "T": { "item": "minecraft:string" }
+    },
+    "result": {
+      "item": "silverlabs:hammock",
+      "count": 1
+    }
+  }
+}