adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/riposte.yaml

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+# Riposte - Vanguard Shield Bearer ability
+# Counter attack after blocking
+
+ability_id: "riposte"
+name: "Riposte"
+description: "After blocking an attack, counter with a swift strike"
+ability_type: "skill"
+base_power: 30
+damage_type: "physical"
+scaling_stat: "strength"
+scaling_factor: 0.5
+mana_cost: 20
+cooldown: 2
+is_aoe: false
+target_count: 1
+effects_applied: []