- Introduced UserDbService and UserDbServiceImpl for user data handling.
- Added UserMapper for converting between User and UserRecord.
- Implemented user creation and retrieval in the database.
- Updated AuthRepository to include user-related methods.
- Enhanced OIDC claims processing to include issuer information.
- Created user table in the database with necessary fields and indexes.
### Description
- Add some endpoints about image:
- POST `/image/upload`
- GET `/image/{id}`
> [!NOTE]
> Since there isn't identity authentication, the `/image` endpoints should be restricted to private network in nginx.
> [!NOTE]
> Volume for backend should be configured in `pod.yaml`.
### Package Changes
```toml
actix-multipart = "0.7.2"
```
### Screenshots
_No response_
### Reference
Resolves#78
### Checklist
- [x] A milestone is set
- [x] The related issuse has been linked to this branch
Reviewed-on: #84
Co-authored-by: SquidSpirit <squid@squidspirit.com>
Co-committed-by: SquidSpirit <squid@squidspirit.com>
