adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/flame_burst.yaml

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+# Flame Burst - Arcanist Pyromancy ability
+# AoE fire burst centered on caster
+
+ability_id: "flame_burst"
+name: "Flame Burst"
+description: "Release a burst of flames around you, scorching all nearby enemies"
+ability_type: "spell"
+base_power: 25
+damage_type: "fire"
+scaling_stat: "intelligence"
+scaling_factor: 0.5
+mana_cost: 18
+cooldown: 2
+is_aoe: true
+target_count: 0
+effects_applied: []