Fix status codes in UpdateProfile, CreateObligation, and DeleteObligation

[aaryan359]

Changes

• Fix UpdateProfile response body returning Status: 201 (http.StatusCreated) while the HTTP response was correctly 200 OK — body now consistently uses http.StatusOK
• Fix CreateObligation response body returning Status: 200 (http.StatusOK) while the HTTP response was correctly 201 Created — body now consistently uses http.StatusCreated
• Fix DeleteObligation sending c.JSON(http.StatusNotFound, er) on a DB update failure — the record was already successfully fetched at that point, so the correct status is http.StatusInternalServerError

Submitter Checklist

• Includes tests (if there is a feature changed/added)
• Includes docs ( if changes are user facing)
• I have tested my changes locally.

References

Location	Was	Now
pkg/auth/auth.go — UpdateProfile response body	Status: http.StatusCreated (201)	Status: http.StatusOK (200)
pkg/api/obligations.go — CreateObligation response body	Status: http.StatusOK (200)	Status: http.StatusCreated (201)
pkg/api/obligations.go — DeleteObligation update failure	c.JSON(http.StatusNotFound, er) (404)	c.JSON(http.StatusInternalServerError, er) (500)

[aaryan359]

@deo002, I found this in the codebase. Could you please take a look and let me know if this is good?