add read-write-permission for user-board and user-article.

[chhsiao1981]

這個 PR 的目的 / Purpose of this PR

add read-write-permission for user-board and user-article.

1. simplify schema to UserBoard and UserArticle
2. api.UserBoardPerm
3. api.UserArticlePerm
4. board.ParentID

相關的 issue / Related Issues

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 40.56738% with 419 lines in your changes missing coverage. Please review.

Project coverage is 55.64%. Comparing base (931c3a8) to head (14cd9a1). Report is 40 commits behind head on main.

Files with missing lines	Patch %	Lines
api/user_board_perm.go	21.31%	127 Missing and 28 partials :warning:
api/user_article_perm.go	34.18%	56 Missing and 21 partials :warning:
schema/article_perm_info.go	0.00%	22 Missing :warning:
api/get_user_info.go	33.33%	15 Missing and 3 partials :warning:
schema/user_board.go	35.71%	14 Missing and 4 partials :warning:
schema/user_article.go	11.11%	14 Missing and 2 partials :warning:
api/errors.go	0.00%	15 Missing :warning:
schema/user_posttime.go	0.00%	12 Missing :warning:
schema/board_perm_info.go	0.00%	9 Missing :warning:
schema/user_perm_info.go	0.00%	9 Missing :warning:
... and 24 more

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #556 +/- ## ========================================== - Coverage 56.58% 55.64% -0.94% ========================================== Files 199 207 +8 Lines 15090 12382 -2708 ========================================== - Hits 8538 6890 -1648 + Misses 5569 4443 -1126 - Partials 983 1049 +66 ```

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