* fix(migrations): make Phase6 completion slide-over migration idempotent
Use IF EXISTS / IF COL_LENGTH guards and explicit EF migration metadata
so partial environments can apply Phase 6 safely.
* feat(locations): add sites options endpoint and vendor contactName
Expose GET /api/locations/sites for the WO create wizard and include
vendor contactName on dropdown responses.
* fix(work-orders): make stacked tip build for CI quality gates
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Co-authored-by: Arthur Bassi <arthur.winiarski.ranger@outlook.com>