Update database schema, APIs, and enable Swagger documentation (#17)

[nikan-negaresh-informed]

• Release version 1.0.0: Update changelog, version, and add database schema documentation.

• Remove foreign key constraints from DATABASE_SCHEMA.md for simplification.

Sensitive Credential Checks

• As the author of these changes, I have checked for any sensitive credentials prior to this review being requested.
• As a reviewer of these changes, I have checked for any sensitive credentials prior to approving this merge.

Motivation and Context

Description

• Describe your changes in detail

How Has This Been Tested?

Screenshots (if appropriate):

Checklist:

• It contains only changes required by issue (does not contain other PR)
• Includes link to an issue (if apply)
• I have added tests to cover my changes.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud