refactor(nav, services): one source of truth for what evig offers and where it appears #1798

Job	Run time
Migration Drift Check	36s
Dependency Security Audit	38s
Run Tests	1m 45s
Code Quality Checks	7m 44s
Auth Smoke Test	1m 11s
Dual-Persona Inventory Smoke	4m 21s
Local E2E Journeys	6m 59s
Main Red Alert (dispatched)	-1s
	23m 13s

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