adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/shadow_assault.yaml

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+# Shadow Assault - Assassin Shadow Dancer ultimate
+# AoE guaranteed crits
+
+ability_id: "shadow_assault"
+name: "Shadow Assault"
+description: "Become one with the shadows and strike all enemies with guaranteed critical hits"
+ability_type: "skill"
+base_power: 80
+damage_type: "physical"
+scaling_stat: "dexterity"
+scaling_factor: 0.7
+mana_cost: 55
+cooldown: 6
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "shadow_crit"
+    name: "Shadow Strike"
+    effect_type: "buff"
+    duration: 1
+    power: 100
+    stat_affected: "crit_chance"
+    stacks: 1
+    max_stacks: 1
+    source: "shadow_assault"