adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/blessed_sacrifice.yaml

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+# Blessed Sacrifice - Oathkeeper Redemption ability
+# Transfer ally wounds to self
+
+ability_id: "blessed_sacrifice"
+name: "Blessed Sacrifice"
+description: "Take an ally's wounds upon yourself, healing them while damaging yourself"
+ability_type: "spell"
+base_power: 50
+damage_type: "holy"
+scaling_stat: "wisdom"
+scaling_factor: 0.5
+mana_cost: 25
+cooldown: 4
+is_aoe: false
+target_count: 1
+effects_applied: []