feat(ops): ECR-007 行为分析与 ECR-008 内容运营后台

落地埋点 ingest/数据看板、首页宫格 CMS 与测评上下架；含账号引导、问答流式与免责声明去重，以及 review P1 审计同事务修复。

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

apps/api/internal/repository/ask_repo.go

@@ -102,3 +102,62 @@ func (r *AskRepo) ConsumeMembershipQuota(ctx context.Context, userID uuid.UUID)
 	}
 	return true, left, nil
 }
+
+// GetAskPaidQuota returns purchased ask pack remaining.
+func (r *AskRepo) GetAskPaidQuota(ctx context.Context, userID uuid.UUID) (int, error) {
+	var n int
+	err := r.Pool.QueryRow(ctx, `
+		SELECT ask_paid_quota_left FROM users WHERE id=$1 AND deleted_at IS NULL`, userID,
+	).Scan(&n)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return 0, nil
+	}
+	return n, err
+}
+
+// AddAskPaidQuota increments purchased ask pack remaining.
+func (r *AskRepo) AddAskPaidQuota(ctx context.Context, userID uuid.UUID, delta int) (int, error) {
+	if delta <= 0 {
+		return 0, errors.New("delta must be positive")
+	}
+	var n int
+	err := r.Pool.QueryRow(ctx, `
+		UPDATE users SET ask_paid_quota_left = ask_paid_quota_left + $2, updated_at=now()
+		WHERE id=$1 AND deleted_at IS NULL
+		RETURNING ask_paid_quota_left`, userID, delta,
+	).Scan(&n)
+	return n, err
+}
+
+// ConsumeAskPaidQuota decrements purchased ask pack remaining.
+func (r *AskRepo) ConsumeAskPaidQuota(ctx context.Context, userID uuid.UUID) (ok bool, left int, err error) {
+	err = r.Pool.QueryRow(ctx, `
+		UPDATE users SET ask_paid_quota_left = ask_paid_quota_left - 1, updated_at=now()
+		WHERE id=$1 AND deleted_at IS NULL AND ask_paid_quota_left > 0
+		RETURNING ask_paid_quota_left`, userID,
+	).Scan(&left)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return false, 0, nil
+	}
+	if err != nil {
+		return false, 0, err
+	}
+	return true, left, nil
+}
+
+// SoftDeleteThread marks a thread and its messages deleted for the owner.
+func (r *AskRepo) SoftDeleteThread(ctx context.Context, userID, threadID uuid.UUID) error {
+	ct, err := r.Pool.Exec(ctx, `
+		UPDATE ask_threads SET deleted_at=now(), updated_at=now()
+		WHERE id=$1 AND user_id=$2 AND deleted_at IS NULL`, threadID, userID)
+	if err != nil {
+		return err
+	}
+	if ct.RowsAffected() == 0 {
+		return errors.New("thread not found")
+	}
+	_, err = r.Pool.Exec(ctx, `
+		UPDATE ask_messages SET deleted_at=now()
+		WHERE thread_id=$1 AND deleted_at IS NULL`, threadID)
+	return err
+}