adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/summon_skeleton.yaml

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+# Summon Skeleton - Necromancer Raise Dead ability
+# Summon skeleton warrior
+
+ability_id: "summon_skeleton"
+name: "Summon Skeleton"
+description: "Raise a skeleton warrior from the dead to fight for you"
+ability_type: "spell"
+base_power: 0
+damage_type: null
+scaling_stat: "charisma"
+scaling_factor: 0.5
+mana_cost: 15
+cooldown: 0
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "skeleton_minion"
+    name: "Skeleton Warrior"
+    effect_type: "buff"
+    duration: 99
+    power: 20
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "summon_skeleton"