adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/death_pact.yaml

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+# Death Pact - Necromancer Raise Dead ability
+# Sacrifice minion for HP/mana
+
+ability_id: "death_pact"
+name: "Death Pact"
+description: "Sacrifice one of your minions to restore your health and mana"
+ability_type: "spell"
+base_power: 50
+damage_type: null
+scaling_stat: "charisma"
+scaling_factor: 0.5
+mana_cost: 0
+cooldown: 5
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "death_pact_heal"
+    name: "Death Pact"
+    effect_type: "hot"
+    duration: 1
+    power: 40
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "death_pact"