docs(rest-api): Add ER diagram for API resources, clean up deprecation dates

[thossain-nv]

Description

• Adds Resource Overview docs page with ER diagram to help users understand relationship between API resources
• Extends incorrect deprecation dates and cleans up deprecation information in OpenAPI schema

Type of Change

• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• No testing required (docs, internal refactor, etc.)

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[github-actions]

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_{🕐 Last updated: 2026-06-12 00:55:00 UTC | Commit: 3bf9fb1}

[github-actions]

🔍 Container Scan Summary

Service	Total	Critical	High	Medium	Low	Other
nico-flow	126	14	55	44	5	8
nico-nsm	133	11	45	66	11	0
nico-psm	128	14	57	44	5	8
nico-rest-api	192	17	89	70	8	8
nico-rest-cert-manager	105	6	52	35	4	8
nico-rest-db	126	14	55	44	5	8
nico-rest-site-agent	125	14	55	44	4	8
nico-rest-workflow	128	14	57	44	5	8
TOTAL	1063	104	465	391	47	56

Per-CVE detail lives in the per-service grype-* artifacts (JSON + SARIF). Severity counts only — no CVE IDs published here.