test: add smoke tests for organizations handler endpoints

[SatishKumar620]

Context

Follow-up to PR #64 which migrated all 8 organization
endpoints to the ORM. No tests were included in that PR.

What needs testing

• GET /organizations (list + search + filters)
• GET /organizations/{id}
• GET /organizations/{id}/domains
• GET /organizations/{id}/bugs
• GET /organizations/{id}/managers
• GET /organizations/{id}/tags
• GET /organizations/{id}/integrations
• GET /organizations/{id}/stats
• GET /organizations/{id}?include=managers,tags,stats

Approach

Follow the same MockDB pattern used in tests/test_orm.py

[owasp-blt]

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[SatishKumar620]

/assign

[owasp-blt]

@SatishKumar620 You have been assigned to this issue! 🎉

Please submit a pull request within 8 hours (by Wed, 18 Mar 2026 23:14:59 UTC).

If you need more time or cannot complete the work, please comment /unassign so others can pick it up.

Happy coding! 🚀 — OWASP BLT-Pool

[ramansh18]

/assign

[owasp-blt]

@ramansh18 This issue already has the maximum number of assignees (1). Please work on a different issue.