adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/guardian_angel.yaml

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+# Guardian Angel - Luminary Divine Protection ability
+# Death prevention buff
+
+ability_id: "guardian_angel"
+name: "Guardian Angel"
+description: "Bless an ally with divine protection that prevents death once"
+ability_type: "spell"
+base_power: 0
+damage_type: null
+scaling_stat: "wisdom"
+scaling_factor: 0.4
+mana_cost: 35
+cooldown: 6
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "guardian_angel_buff"
+    name: "Guardian Angel"
+    effect_type: "buff"
+    duration: 5
+    power: 1
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "guardian_angel"