adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/aimed_shot.yaml

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+# Aimed Shot - Wildstrider Marksmanship ability
+# High accuracy ranged attack
+
+ability_id: "aimed_shot"
+name: "Aimed Shot"
+description: "Take careful aim and fire a precise shot at your target"
+ability_type: "attack"
+base_power: 18
+damage_type: "physical"
+scaling_stat: "dexterity"
+scaling_factor: 0.6
+mana_cost: 8
+cooldown: 1
+is_aoe: false
+target_count: 1
+effects_applied: []