adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/frozen_orb.yaml

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+# Frozen Orb - Arcanist Cryomancy ability
+# AoE freeze with damage
+
+ability_id: "frozen_orb"
+name: "Frozen Orb"
+description: "Launch a swirling orb of frost that freezes enemies in its path"
+ability_type: "spell"
+base_power: 28
+damage_type: "ice"
+scaling_stat: "intelligence"
+scaling_factor: 0.5
+mana_cost: 20
+cooldown: 3
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "frozen"
+    name: "Frozen"
+    effect_type: "stun"
+    duration: 1
+    power: 0
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "frozen_orb"