adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/glacial_spike.yaml

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+# Glacial Spike - Arcanist Cryomancy ability
+# Heavy single target with freeze
+
+ability_id: "glacial_spike"
+name: "Glacial Spike"
+description: "Impale your target with a massive spike of ice, dealing heavy damage and freezing them"
+ability_type: "spell"
+base_power: 60
+damage_type: "ice"
+scaling_stat: "intelligence"
+scaling_factor: 0.6
+mana_cost: 40
+cooldown: 3
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "deep_freeze"
+    name: "Deep Freeze"
+    effect_type: "stun"
+    duration: 2
+    power: 0
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "glacial_spike"