adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/taunt.yaml

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+# Taunt - Oathkeeper Aegis of Light ability
+# Force enemies to attack you
+
+ability_id: "taunt"
+name: "Taunt"
+description: "Force all enemies to focus their attacks on you"
+ability_type: "skill"
+base_power: 0
+damage_type: null
+scaling_stat: "constitution"
+scaling_factor: 0.3
+mana_cost: 8
+cooldown: 3
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "taunted"
+    name: "Taunted"
+    effect_type: "debuff"
+    duration: 2
+    power: 100
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "taunt"