fix: replace V018 with V019 (fixed SQL quote escaping)

V018 had PostgreSQL quote escaping issues with long content strings.
V019 uses 1256 quoting to avoid escaping problems and cleanly inserts
all 12 blog posts (5 updates + 7 new) with middle-school level language.

Deletes V018, commits V019 as replacement.

migrations/V002__SeedData.sql

@@ -0,0 +1,17 @@
+-- V002 - Seed Categories and Settings
+
+INSERT INTO categories (name, slug, sort_order) VALUES
+    ('사업자 세무',   'business-tax',    1),
+    ('부동산 세금',   'real-estate-tax', 2),
+    ('종합소득세',    'income-tax',      3),
+    ('부가가치세',    'vat',             4),
+    ('가족자산·증여', 'family-asset',    5)
+ON CONFLICT (slug) DO NOTHING;
+
+INSERT INTO site_settings (key, value) VALUES
+    ('site.title',           '백원숙 세무회계 | 사업자·부동산·증여 세무 상담'),
+    ('site.description',     '사업자 기장, 부동산 양도세·증여세, 종합소득세 전문 상담. 온라인 맞춤 상담 제공.'),
+    ('kakao.channel.url',    ''),
+    ('phone.main',           ''),
+    ('consultation.fee.text','상담료 7만~20만 원, 계약 체결 시 일부 차감')
+ON CONFLICT (key) DO NOTHING;