adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/cleanse.yaml

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+# Cleanse - Oathkeeper Redemption ability
+# Remove all debuffs
+
+ability_id: "cleanse"
+name: "Cleanse"
+description: "Purify an ally, removing all negative effects"
+ability_type: "spell"
+base_power: 0
+damage_type: null
+scaling_stat: "wisdom"
+scaling_factor: 0.3
+mana_cost: 18
+cooldown: 3
+is_aoe: false
+target_count: 1
+effects_applied: []