adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/precise_strike.yaml

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+# Precise Strike - Assassin Blade Specialist ability
+# High crit chance attack
+
+ability_id: "precise_strike"
+name: "Precise Strike"
+description: "A calculated strike aimed at vital points with increased critical chance"
+ability_type: "attack"
+base_power: 15
+damage_type: "physical"
+scaling_stat: "dexterity"
+scaling_factor: 0.5
+mana_cost: 8
+cooldown: 1
+is_aoe: false
+target_count: 1
+effects_applied: []