adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/thousand_cuts.yaml

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+# Thousand Cuts - Assassin Blade Specialist ultimate
+# Multi-hit flurry
+
+ability_id: "thousand_cuts"
+name: "Thousand Cuts"
+description: "Unleash a flurry of strikes, each with 50% crit chance"
+ability_type: "attack"
+base_power: 100
+damage_type: "physical"
+scaling_stat: "dexterity"
+scaling_factor: 0.7
+mana_cost: 60
+cooldown: 5
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "bleeding_wounds"
+    name: "Bleeding Wounds"
+    effect_type: "dot"
+    duration: 3
+    power: 15
+    stat_affected: null
+    stacks: 1
+    max_stacks: 5
+    source: "thousand_cuts"