[Task] 포스트 페이지 구현

### ISSUE
- Group: `client`, `server`, `sr`
- Type: `bug`, `feature`, `delete`
- Detail: fix actions from client redux

### TODO
1. [ ] Job1
2. [ ] Job2
3. [ ] Job3

### Estimated time
> Pick one
### `0.5h`
### `1h`
### `1.5h`
### `2h`
### `2.5h`
### `3h`

### Labels
- Estimated time: `E: 1h`
- Group : `client`, `server`
- Sprint: `Sprint__NUMBER__`
- Urgency: `High`, `Middle`, `Low`

Start by reviewing the client Redux actions mentioned in the issue and locate the post-page entry point. The three listed jobs are still placeholders, so clarify the required client and server behavior before making changes; done should mean the post page works with the intended Redux actions.

Written by the indexing model from the issue text.