adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/piercing_shot.yaml

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+# Piercing Shot - Wildstrider Marksmanship ability
+# Line AoE that pierces through enemies
+
+ability_id: "piercing_shot"
+name: "Piercing Shot"
+description: "Fire a powerful arrow that pierces through all enemies in a line"
+ability_type: "attack"
+base_power: 40
+damage_type: "physical"
+scaling_stat: "dexterity"
+scaling_factor: 0.55
+mana_cost: 28
+cooldown: 3
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "armor_pierced"
+    name: "Armor Pierced"
+    effect_type: "debuff"
+    duration: 2
+    power: 15
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "piercing_shot"