adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/summon_companion.yaml

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+# Summon Companion - Wildstrider Beast Companion ability
+# Summon animal pet
+
+ability_id: "summon_companion"
+name: "Summon Companion"
+description: "Call your loyal animal companion to fight by your side"
+ability_type: "skill"
+base_power: 0
+damage_type: null
+scaling_stat: "wisdom"
+scaling_factor: 0.5
+mana_cost: 15
+cooldown: 0
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "companion_active"
+    name: "Animal Companion"
+    effect_type: "buff"
+    duration: 99
+    power: 20
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "summon_companion"