Combat Backend & Data Models

- Implement Combat Service
- Implement Damage Calculator
- Implement Effect Processor
- Implement Combat Actions
- Created Combat API Endpoints

api/app/data/enemies/goblin_shaman.yaml

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+# Goblin Shaman - Easy caster enemy (INT-focused)
+# A goblin spellcaster that provides magical support
+
+enemy_id: goblin_shaman
+name: Goblin Shaman
+description: >
+  A hunched goblin wrapped in tattered robes, clutching a staff adorned
+  with bones and feathers. It mutters dark incantations and hurls bolts
+  of sickly green fire at its enemies.
+
+base_stats:
+  strength: 4
+  dexterity: 10
+  constitution: 6
+  intelligence: 12
+  wisdom: 10
+  charisma: 6
+  luck: 10
+
+abilities:
+  - basic_attack
+  - fire_bolt
+  - minor_heal
+
+loot_table:
+  - item_id: shaman_staff
+    drop_chance: 0.10
+    quantity_min: 1
+    quantity_max: 1
+  - item_id: mana_potion_small
+    drop_chance: 0.20
+    quantity_min: 1
+    quantity_max: 1
+  - item_id: gold_coin
+    drop_chance: 0.60
+    quantity_min: 3
+    quantity_max: 8
+
+experience_reward: 25
+gold_reward_min: 5
+gold_reward_max: 15
+difficulty: easy
+
+tags:
+  - humanoid
+  - goblinoid
+  - caster
+  - small
+
+base_damage: 3
+crit_chance: 0.08
+flee_chance: 0.55