adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/vital_strike.yaml

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+# Vital Strike - Assassin Blade Specialist ability
+# Massive crit damage
+
+ability_id: "vital_strike"
+name: "Vital Strike"
+description: "Strike a vital organ for massive critical damage"
+ability_type: "attack"
+base_power: 30
+damage_type: "physical"
+scaling_stat: "dexterity"
+scaling_factor: 0.55
+mana_cost: 18
+cooldown: 2
+is_aoe: false
+target_count: 1
+effects_applied: []