adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/unbreakable.yaml

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+# Unbreakable - Vanguard Shield Bearer ultimate
+# Massive damage reduction
+
+ability_id: "unbreakable"
+name: "Unbreakable"
+description: "Channel your inner strength to become nearly invulnerable, reducing all damage by 75% for 5 turns"
+ability_type: "defend"
+base_power: 0
+damage_type: null
+scaling_stat: "constitution"
+scaling_factor: 0.3
+mana_cost: 50
+cooldown: 6
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "unbreakable_buff"
+    name: "Unbreakable"
+    effect_type: "buff"
+    duration: 5
+    power: 75
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "unbreakable"