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/elf.toml

@@ -7,3 +7,26 @@ dexterity = 2
 constitution = -1
 intelligence = 2
 wisdom = 0
+perception = 1
+charisma = 0
+
+[body]
+size = "medium"
+weight = 130
+
+traits = ["infravision", "magic_affinity"]
+disadvantages = ["iron_sensitivity"]
+
+[resistances]
+charm = 0.5
+
+[regen]
+hp = 0.8
+mana = 1.3
+endurance = 0.9
+
+[misc]
+lifespan = 800
+diet = "omnivore"
+xp_rate = 0.95
+vision = ["normal", "infravision"]