adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/divine_aegis.yaml

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+# Divine Aegis - Oathkeeper Aegis of Light ability
+# Massive party shield
+
+ability_id: "divine_aegis"
+name: "Divine Aegis"
+description: "Invoke divine protection to create a powerful shield around all allies"
+ability_type: "spell"
+base_power: 60
+damage_type: null
+scaling_stat: "wisdom"
+scaling_factor: 0.6
+mana_cost: 45
+cooldown: 5
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "divine_aegis_shield"
+    name: "Divine Aegis"
+    effect_type: "shield"
+    duration: 3
+    power: 50
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "divine_aegis"