docs(17): create phase plan for object storage migration

.planning/ROADMAP.md

@@ -161,7 +161,11 @@ Plans:
   2. All previously uploaded images are accessible after migration to MinIO (no broken images)
   3. Image URLs work correctly in all views (collection, planning, setups, comparison table)
   4. Docker Compose includes MinIO for local development with no manual bucket setup required
-**Plans**: TBD
+**Plans:** 3 plans
+Plans:
+- [ ] 17-01-PLAN.md — Storage service abstraction + Docker Compose MinIO infrastructure
+- [ ] 17-02-PLAN.md — Server-side image handling refactoring (routes, services, MCP tools)
+- [ ] 17-03-PLAN.md — Client component updates + image migration script
 
 ### Phase 18: Global Items & Public Profiles
 **Goal**: Users can discover gear through a global catalog and share their setups publicly via profile pages
@@ -196,5 +200,5 @@ Plans:
 | 14. PostgreSQL Migration | v2.0 | 0/? | Not started | - |
 | 15. External Authentication | v2.0 | 0/? | Not started | - |
 | 16. Multi-User Data Model | v2.0 | 2/4 | Complete    | 2026-04-05 |
-| 17. Object Storage | v2.0 | 0/? | Not started | - |
+| 17. Object Storage | v2.0 | 0/3 | Not started | - |
 | 18. Global Items & Public Profiles | v2.0 | 0/? | Not started | - |