adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/mass_enhancement.yaml

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+# Mass Enhancement - Lorekeeper Arcane Weaving ability
+# AoE stat buff
+
+ability_id: "mass_enhancement"
+name: "Mass Enhancement"
+description: "Enhance all allies with arcane power, increasing all their stats"
+ability_type: "spell"
+base_power: 0
+damage_type: null
+scaling_stat: "intelligence"
+scaling_factor: 0.5
+mana_cost: 32
+cooldown: 4
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "enhanced"
+    name: "Enhanced"
+    effect_type: "buff"
+    duration: 4
+    power: 15
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "mass_enhancement"