adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/soul_rot.yaml

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+# Soul Rot - Necromancer Dark Affliction ability
+# DoT + reduced healing on target
+
+ability_id: "soul_rot"
+name: "Soul Rot"
+description: "Rot your target's soul, dealing shadow damage over time and reducing their healing received"
+ability_type: "spell"
+base_power: 45
+damage_type: "shadow"
+scaling_stat: "intelligence"
+scaling_factor: 0.6
+mana_cost: 38
+cooldown: 4
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "rotting_soul"
+    name: "Soul Rot"
+    effect_type: "dot"
+    duration: 4
+    power: 15
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "soul_rot"
+  - effect_id: "healing_reduction"
+    name: "Corrupted"
+    effect_type: "debuff"
+    duration: 4
+    power: 50
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "soul_rot"