Add project roadmap and architecture docs

ROADMAP.md

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+# Serato Doctor Roadmap
+
+## v0.1 — Library Inspector
+
+- [x] Project repository
+- [x] Filesystem scanner
+- [x] Serato crate parser
+- [x] Missing reference CSV report
+- [x] Grouped missing reference report
+- [ ] HTML health dashboard
+- [ ] Test suite
+- [ ] Sample library fixtures
+- [ ] Database V2 read-only parser
+
+## v0.2 — Diagnostics
+
+- [ ] Duplicate filename detection
+- [ ] Duplicate audio hash detection
+- [ ] Broken symlink detection
+- [ ] Orphaned audio detection
+- [ ] OneDrive rename detection
+- [ ] Crate classification: static vs smart/dynamic
+- [ ] Library health score
+
+## v0.3 — Safe Repair
+
+- [ ] Dry-run repair plan
+- [ ] Backup before repair
+- [ ] Compatibility symlink creation
+- [ ] Compatibility copy creation
+- [ ] Rename repair
+- [ ] Rollback log
+
+## v0.4 — Migration Wizard
+
+- [ ] Move library root
+- [ ] Cloud provider migration
+- [ ] External drive migration
+- [ ] Verify moved library
+- [ ] Update application references
+
+## v1.0 — DJ Library Doctor
+
+- [ ] Desktop UI
+- [ ] Serato support
+- [ ] Rekordbox support
+- [ ] VirtualDJ support
+- [ ] Engine DJ support