adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/absolute_zero.yaml

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+# Absolute Zero - Arcanist Cryomancy ultimate
+# Ultimate freeze all enemies
+
+ability_id: "absolute_zero"
+name: "Absolute Zero"
+description: "Lower the temperature to absolute zero, freezing all enemies solid and dealing massive ice damage"
+ability_type: "spell"
+base_power: 90
+damage_type: "ice"
+scaling_stat: "intelligence"
+scaling_factor: 0.7
+mana_cost: 70
+cooldown: 6
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "absolute_freeze"
+    name: "Absolute Zero"
+    effect_type: "stun"
+    duration: 2
+    power: 0
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "absolute_zero"
+  - effect_id: "shattered"
+    name: "Shattered"
+    effect_type: "dot"
+    duration: 2
+    power: 20
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "absolute_zero"