feat(spark_pet): major overhaul — traits, animations, riding, fire, coloured hatching

- Movement: slower follow (speed 0.3, stop_dist 5), near-zero teleport chance
- Scales: baby 0.65, juvenile 0.9, adult 1.3 (up from 0.4/0.7/1.0)
- Personality traits (0–4): set by feeding specific foods while sneaking;
  affects stroll range, follow distance, look-at-player frequency
- Passtime animations driven by pure Molang lifecycle math (no timer components):
  groom, sniff, stretch, happy_bounce cycling ~every 3 min per dragon
- Rideable adults: minecraft:rideable + input_ground_controlled, seat at [0,0.9,-0.3]
- Fire breathing: autonomous vs monsters (radius 16) + player-triggered (sneak + fire_charge)
- New hatching system: 6 nest block variants (oak/spruce/jungle/crimson/warped/obsidian),
  craft nest + dragon_egg → coloured egg item; place egg, bonemeal + blaze powder → hatch;
  dragon colour matches nest type via 6 separate egg entity types + born_color events
- 18 new PNG textures: 6 dragon colours, 6 nest blocks, 6 egg items (HSV hue rotation)
- Render controller updated to use texture array indexed by silverlabs:dragon_color property

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

addon/spark_pet_RP/entity/spark_dragon.entity.json

@@ -7,7 +7,12 @@
         "default": "entity_alphatest"
       },
       "textures": {
-        "default": "textures/entity/spark_dragon"
+        "color_0": "textures/entity/spark_dragon_white",
+        "color_1": "textures/entity/spark_dragon_brown",
+        "color_2": "textures/entity/spark_dragon_green",
+        "color_3": "textures/entity/spark_dragon_red",
+        "color_4": "textures/entity/spark_dragon_teal",
+        "color_5": "textures/entity/spark_dragon_black"
       },
       "geometry": {
         "default": "geometry.spark_dragon"
@@ -21,6 +26,11 @@
         "sit": "animation.spark_dragon.sit",
         "sleep": "animation.spark_dragon.sleep",
         "fly": "animation.spark_dragon.fly",
+        "groom": "animation.spark_dragon.groom",
+        "sniff": "animation.spark_dragon.sniff",
+        "stretch": "animation.spark_dragon.stretch",
+        "happy_bounce": "animation.spark_dragon.happy_bounce",
+        "fire_breath": "animation.spark_dragon.fire_breath",
         "controller": "controller.animation.spark_dragon",
         "beacon_controller": "controller.animation.spark_dragon.beacon",
         "mood_controller": "controller.animation.spark_dragon.mood"