feat(D-01): add test_component_gag.json demonstrating component system

JSON item using all 3 implemented components: lockable (lock_resistance: 200),
resistance (base: 80), and gagging (comprehension: 0.15, range: 8.0).

src/main/resources/data/tiedup/tiedup_items/test_component_gag.json

@@ -0,0 +1,24 @@
+{
+  "type": "tiedup:bondage_item",
+  "display_name": "Component Test Gag",
+  "model": "tiedup:models/gltf/v2/handcuffs/cuffs_prototype.glb",
+  "regions": ["MOUTH"],
+  "pose_priority": 10,
+  "escape_difficulty": 3,
+  "lockable": true,
+  "animation_bones": {
+    "idle": []
+  },
+  "components": {
+    "lockable": {
+      "lock_resistance": 200
+    },
+    "resistance": {
+      "base": 80
+    },
+    "gagging": {
+      "comprehension": 0.15,
+      "range": 8.0
+    }
+  }
+}