feat(market): 采用元宝岗位/职能分类(14类)替代人群场景 + AI验证期自动归类

migrations/019_normalize_marketapp_scene_v2.sql

@@ -0,0 +1,11 @@
+-- 019: 场景分类从「人群→场景」改为「岗位/职能」(元宝清单)，清空旧 persona 取值交由 AI/重导重新归类。
+-- 幂等：仅把已知旧 id 置空，重跑无害。
+UPDATE market_apps
+SET capability = NULL
+WHERE capability IN (
+    'freelance_content','freelance_client','freelance_finance',
+    'office_doc','office_data','office_email','office_pm',
+    'edu_prepare','edu_grade','edu_tutor','edu_home',
+    'biz_product','biz_service','biz_ops',
+    'general_write','general_research','general_agent'
+);