adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/miracle.yaml

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+# Miracle - Oathkeeper Redemption ultimate
+# Full party heal + cleanse all
+
+ability_id: "miracle"
+name: "Miracle"
+description: "Perform a divine miracle that fully heals all allies and cleanses all negative effects"
+ability_type: "spell"
+base_power: 100
+damage_type: "holy"
+scaling_stat: "wisdom"
+scaling_factor: 0.7
+mana_cost: 70
+cooldown: 8
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "miraculous_healing"
+    name: "Miraculous"
+    effect_type: "hot"
+    duration: 3
+    power: 20
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "miracle"