adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/power_strike.yaml

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+# Power Strike - Vanguard Weapon Master ability
+# Heavy attack dealing 150% weapon damage
+
+ability_id: "power_strike"
+name: "Power Strike"
+description: "A heavy attack that deals 150% weapon damage"
+ability_type: "attack"
+base_power: 15
+damage_type: "physical"
+scaling_stat: "strength"
+scaling_factor: 0.6
+mana_cost: 8
+cooldown: 1
+is_aoe: false
+target_count: 1
+effects_applied: []