adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/multishot.yaml

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+# Multishot - Wildstrider Marksmanship ability
+# Hit multiple targets
+
+ability_id: "multishot"
+name: "Multishot"
+description: "Fire multiple arrows in quick succession, hitting up to 3 targets"
+ability_type: "attack"
+base_power: 22
+damage_type: "physical"
+scaling_stat: "dexterity"
+scaling_factor: 0.5
+mana_cost: 18
+cooldown: 2
+is_aoe: true
+target_count: 3
+effects_applied: []