Flexible race system with slot-based equipment and dragon race

- Expand race TOML schema: 7 stats, body shape (size/weight/custom slots),
  natural armor and attacks with damage types, resistances, traits/disadvantages,
  regen multipliers, vision types, XP rate, guild compatibility
- Replace equipped_weapon/equipped_armor with slot-based HashMap<String, Object>
- Each race defines available equipment slots; default humanoid slots as fallback
- Combat uses natural weapons/armor from race when no gear equipped
- DB migration from old weapon/armor columns to equipped_json
- Add Dragon race: huge body, custom slots (forelegs/wings/tail), fire breath,
  natural armor 8, fire immune, slow XP rate for balance
- Update all existing races with expanded fields (traits, resistances, vision, regen)
- Objects gain optional slot field; kind=weapon/armor still works as fallback
- Update chargen to display race traits, size, natural attacks, vision
- Update stats display to show equipment and natural bonuses separately
- Update TESTING.md and AGENTS.md with race/slot system documentation

Made-with: Cursor

world/races/dragon.toml

@@ -0,0 +1,65 @@
+name = "Dragon"
+description = "Ancient and mighty, dragons are creatures of immense power and terrifying intellect. Their scaled bodies house furnace-hot hearts and minds sharp enough to match any scholar."
+metarace = "draconic"
+
+[stats]
+strength = 4
+dexterity = -2
+constitution = 3
+intelligence = 1
+wisdom = 1
+perception = 2
+charisma = -1
+
+[body]
+size = "huge"
+weight = 2000
+slots = ["head", "neck", "torso", "forelegs", "hindlegs", "tail", "wings", "main_hand", "off_hand"]
+
+[natural]
+armor = 8
+
+[natural.attacks]
+[natural.attacks.bite]
+damage = 12
+type = "physical"
+
+[natural.attacks.claw]
+damage = 8
+type = "physical"
+
+[natural.attacks.tail_sweep]
+damage = 6
+type = "physical"
+
+[natural.attacks.fire_breath]
+damage = 15
+type = "fire"
+cooldown_ticks = 5
+
+traits = ["flight", "fire_breath", "darkvision", "frightful_presence", "ancient_knowledge", "treasure_sense"]
+disadvantages = ["conspicuous", "slow_leveling", "large_target", "cannot_enter_small_spaces"]
+
+[resistances]
+fire = 0.0
+cold = 1.5
+physical = 0.7
+poison = 0.3
+
+[regen]
+hp = 1.5
+mana = 1.2
+endurance = 0.8
+
+[guild_compatibility]
+good = ["sorcerer", "elementalist"]
+average = ["warrior", "berserker"]
+poor = ["thief", "bard"]
+restricted = ["monk"]
+
+[misc]
+lifespan = 5000
+diet = "carnivore"
+xp_rate = 0.7
+natural_terrain = ["mountains", "caves", "volcanic"]
+vision = ["normal", "darkvision", "infravision", "thermal"]