feat(ECR-011): 昵称、首页贴士与档案 Self 唯一/合盘交叉校验

每账号仅一条 self（migration 40902）；合盘只选 TA；账号昵称可改；首页穿衣/颜色/养生贴士。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/migrations/000017_unique_self_profile.up.sql

@@ -0,0 +1,16 @@
+-- One active self profile per user; soft-delete older duplicates first.
+
+WITH ranked AS (
+  SELECT id,
+         ROW_NUMBER() OVER (PARTITION BY user_id ORDER BY created_at DESC, id DESC) AS rn
+  FROM profiles
+  WHERE relation = 'self' AND deleted_at IS NULL
+)
+UPDATE profiles p
+SET deleted_at = now(), updated_at = now()
+FROM ranked r
+WHERE p.id = r.id AND r.rn > 1 AND p.deleted_at IS NULL;
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_profiles_one_self_per_user
+  ON profiles (user_id)
+  WHERE relation = 'self' AND deleted_at IS NULL;