adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/inferno.yaml

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+# Inferno - Arcanist Pyromancy ability
+# AoE fire DoT
+
+ability_id: "inferno"
+name: "Inferno"
+description: "Summon a raging inferno that burns all enemies for 3 turns"
+ability_type: "spell"
+base_power: 35
+damage_type: "fire"
+scaling_stat: "intelligence"
+scaling_factor: 0.55
+mana_cost: 30
+cooldown: 3
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "inferno_burn"
+    name: "Inferno Flames"
+    effect_type: "dot"
+    duration: 3
+    power: 10
+    stat_affected: null
+    stacks: 1
+    max_stacks: 3
+    source: "inferno"