204 Notify seeker on donor accept

[mahinuzzaman]

Fixes #204

• Added notify seeker when a donor accepts the request

• Fixed get user json issue

• Update swagger to use domain url

• [x] Does not depend on other PRs

• [ ] Depends on other PR being merged first: #

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• [x] Bugfix
• [x] Improvement
• [x] New feature
• [ ] Refactor
• [ ] Infrastructure
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• [x] I have tested these changes locally and they function as expected.
• [ ] I have added or updated necessary documentation to reflect the changes.
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• [x] I have updated necessary OpenAPI specs

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