adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/blizzard.yaml

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+# Blizzard - Arcanist Cryomancy ability
+# AoE ice damage with slow
+
+ability_id: "blizzard"
+name: "Blizzard"
+description: "Summon a devastating blizzard that damages and slows all enemies"
+ability_type: "spell"
+base_power: 40
+damage_type: "ice"
+scaling_stat: "intelligence"
+scaling_factor: 0.55
+mana_cost: 32
+cooldown: 3
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "frostbitten"
+    name: "Frostbitten"
+    effect_type: "debuff"
+    duration: 3
+    power: 30
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "blizzard"