feat: update dashboard endpoint for inventory section

[ferruhcihan]

Implements

https://jira.linode.com/browse/APL-676
https://docs.google.com/document/d/1lAyeEZsfpP0nknxOua4actvsaeor6JGq22KrREG0BzU/edit?usp=sharing

📌 Summary

This PR updates the dashboard endpoint for inventory section.

CONSOLE

🔍 Reviewer Notes

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🔴	Statements	50.22%	2235/4450
🔴	Branches	34.17% (-0.4% 🔻)	354/1036
🔴	Functions	42.98%	413/961
🔴	Lines	50.59%	2100/4151

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🟡	api/v1/dashboard.ts	66.67%	100%	50%	66.67%

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🔴	otomi-stack.ts	20.68%	16.25% (-0.63% 🔻)	17.85%	20.84%

Test suite run success

289 tests passing in 12 suites.

Report generated by 🧪jest coverage report action from 049fb5d