adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/arcane_weakness.yaml

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+# Arcane Weakness - Lorekeeper Arcane Weaving ability
+# Stat debuff on enemy
+
+ability_id: "arcane_weakness"
+name: "Arcane Weakness"
+description: "Expose the weaknesses in your enemy's defenses, reducing their resistances"
+ability_type: "spell"
+base_power: 0
+damage_type: "arcane"
+scaling_stat: "intelligence"
+scaling_factor: 0.5
+mana_cost: 25
+cooldown: 3
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "weakened_defenses"
+    name: "Weakened"
+    effect_type: "debuff"
+    duration: 4
+    power: 25
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "arcane_weakness"