add data migrations for artifacts and artifact_skills

db/data/20251203205953_populate_artifacts.rb

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+# frozen_string_literal: true
+
+class PopulateArtifacts < ActiveRecord::Migration[8.0]
+  def up
+    require 'csv'
+
+    csv_path = Rails.root.join('lib', 'seeds', 'artifacts.csv')
+    csv_text = File.read(csv_path)
+    csv = CSV.parse(csv_text, headers: true, encoding: 'UTF-8')
+
+    puts 'Creating artifact records...'
+    csv.each do |row|
+      artifact = Artifact.find_or_initialize_by(granblue_id: row['granblue_id'])
+      artifact.assign_attributes(
+        name_en: row['name_en'],
+        name_jp: row['name_jp'],
+        proficiency: row['proficiency'].presence,
+        rarity: row['rarity'],
+        release_date: row['release_date']
+      )
+      artifact.save!
+      puts "  #{artifact.granblue_id}: #{artifact.name_en}"
+    end
+
+    puts "\nCreated #{Artifact.count} artifact records"
+  end
+
+  def down
+    Artifact.delete_all
+  end
+end

db/data/20251203210023_populate_artifact_skills.rb

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+# frozen_string_literal: true
+
+class PopulateArtifactSkills < ActiveRecord::Migration[8.0]
+  def up
+    json_path = Rails.root.join('lib', 'seeds', 'artifact_skills.json')
+    json_text = File.read(json_path)
+    skills = JSON.parse(json_text)
+
+    puts 'Creating artifact skill records...'
+    skills.each do |skill_data|
+      skill = ArtifactSkill.find_or_initialize_by(
+        skill_group: skill_data['skill_group'],
+        modifier: skill_data['modifier']
+      )
+      skill.assign_attributes(
+        name_en: skill_data['name_en'],
+        name_jp: skill_data['name_jp'],
+        base_values: skill_data['base_values'],
+        growth: skill_data['growth'],
+        suffix_en: skill_data['suffix_en'] || '',
+        suffix_jp: skill_data['suffix_jp'] || '',
+        polarity: skill_data['polarity']
+      )
+      skill.save!
+      puts "  Group #{skill_data['skill_group']}, Mod #{skill_data['modifier']}: #{skill.name_en}"
+    end
+
+    # Clear cache after seeding
+    ArtifactSkill.clear_cache!
+
+    puts "\nCreated #{ArtifactSkill.count} artifact skill records"
+  end
+
+  def down
+    ArtifactSkill.delete_all
+  end
+end