adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/holy_shield.yaml

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+# Holy Shield - Luminary Divine Protection ability
+# Grant damage absorb shield
+
+ability_id: "holy_shield"
+name: "Holy Shield"
+description: "Grant an ally a protective barrier of holy light that absorbs damage"
+ability_type: "spell"
+base_power: 30
+damage_type: null
+scaling_stat: "wisdom"
+scaling_factor: 0.5
+mana_cost: 15
+cooldown: 2
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "holy_shield_barrier"
+    name: "Holy Shield"
+    effect_type: "shield"
+    duration: 3
+    power: 30
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "holy_shield"