[Custom Issue]: Document Validation Rules

[Varsha-1605]

📝 Issue Description

Create comprehensive documentation for all model validation rules.

🎯 Expected Outcome

Acceptance Criteria:

Document field constraints
List validation rules
Add validation examples
Create error message documentation
Include validation testing guide

📋 Additional Context

No response

📜 Confirmation

• I have reviewed the existing issues to avoid duplication
• I have provided sufficient detail for others to understand the issue

[github-actions]

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