adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/rending_blow.yaml

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+# Rending Blow - Vanguard Weapon Master ability
+# Attack with bleed DoT
+
+ability_id: "rending_blow"
+name: "Rending Blow"
+description: "Strike with such force that your enemy bleeds for 3 turns"
+ability_type: "attack"
+base_power: 35
+damage_type: "physical"
+scaling_stat: "strength"
+scaling_factor: 0.5
+mana_cost: 25
+cooldown: 2
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "bleed"
+    name: "Bleeding"
+    effect_type: "dot"
+    duration: 3
+    power: 8
+    stat_affected: null
+    stacks: 1
+    max_stacks: 3
+    source: "rending_blow"