adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/mirror_image.yaml

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+# Mirror Image - Lorekeeper Illusionist ability
+# Summon decoys
+
+ability_id: "mirror_image"
+name: "Mirror Image"
+description: "Create illusory copies of yourself that absorb enemy attacks"
+ability_type: "spell"
+base_power: 0
+damage_type: null
+scaling_stat: "charisma"
+scaling_factor: 0.5
+mana_cost: 28
+cooldown: 5
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "mirror_images"
+    name: "Mirror Images"
+    effect_type: "shield"
+    duration: 4
+    power: 40
+    stat_affected: null
+    stacks: 3
+    max_stacks: 3
+    source: "mirror_image"