feat(cms): add network page video upload

docs/payload-field-inventory.md

@@ -30,7 +30,7 @@ This inventory records the frontend or platform owner for every retained `Pages`
 | `mitgliedWerden.*` | `src/spa/pages/MitgliedWerden.tsx` and `src/spa/components/membership/MembershipWizard.tsx`. |
 | `preistraegerIndex.*` | `src/spa/pages/Preistraeger.tsx`; winner records remain collection-owned. |
 | `pressIndex.hero.*`, `pressIndex.events.*`, `pressIndex.news.*`, `pressIndex.downloads.*` | `src/spa/pages/Press.tsx`; event/article records remain collection-owned, while missing-field labels and images are presentation fallbacks only. |
-| `netzwerk.hero.*`, `netzwerk.patronage.*`, `netzwerk.juryIntro.*`, `netzwerk.expertise.*`, `netzwerk.sponsoring.*` | `src/spa/pages/Netzwerk.tsx`. |
+| `netzwerk.hero.*`, `netzwerk.patronage.*`, `netzwerk.juryIntro.*`, `netzwerk.expertise.*`, `netzwerk.sponsoring.*` | `src/spa/pages/Netzwerk.tsx`. The page-owned `netzwerk.patronage.greetingVideo` Media relationship and its adjacent button/modal copy control only the Ilse Aigner greeting on `/netzwerk`; they never inherit `home.videoModal.*`. |
 | `netzwerk.jury.{eyebrow,heading,description,chairBadge,members}` | Jury heading and authoritative rendered relationship selection in `src/spa/pages/Netzwerk.tsx`. |
 | `netzwerk.partners.{eyebrow,heading,description,detailLabel,tiers,modal}` | Partner section, tier labels, and modal copy in `src/spa/pages/Netzwerk.tsx`; partner records remain collection-owned. |
 | `netzwerk.sponsoringForm.*` | The two visible form steps, validation, success state, and footer copy in `src/spa/components/forms/SponsoringForm.tsx`. |