fix(content): owner never pays for their own files; purchased serves from cache

- serve_content takes owner_session: a validated operator session skips the
  availability/paid gates (Availability::Nobody stays delisted); the cookie
  is re-validated in the content handler, same discipline as the model proxy
- the Tor proxy serves already-purchased items from the local content_owned
  cache with Range slicing (206) instead of re-hitting the seller's 402 —
  the buyer-side store exists so an owned item is never bought twice, and
  its cards were rendering as permanent placeholders
- adapter: 'own'-scope items never render locked (a locked card suppresses
  the playable URL — the placeholder-only grid the operator reported)
- broker: normalize 'purchased' OwnedRpcItems per item with the seller's
  onion, and group 'peers' items per seller onion, so buildMediaUrl gets a
  peerOnion and card URLs stop coming out empty

Co-Authored-By: Claude <noreply@anthropic.com>

neode-ui/src/composables/archyContentAdapter.ts

@@ -314,7 +314,12 @@ function buildMediaUrl(item: ArchyContentItem, opts: AdaptContentOptions): strin
 
 export function adaptToFilm(item: ArchyContentItem, opts: AdaptContentOptions): Film {
   const priceSats = paidPriceSats(item.access)
-  const locked = priceSats !== null
+  // 'own' items are served to the authenticated owner by the node's
+  // owner-bypass (`serve_content`) even when they're listed paid for
+  // buyers — the operator never pays for their own files, so never lock
+  // them (a locked card suppresses the playable URL, which is exactly the
+  // placeholder-only grid the operator reported).
+  const locked = opts.source !== 'own' && priceSats !== null
   const sourceType = FILM_SOURCE_TYPE[opts.source]
   return {
     id: item.id,
@@ -348,7 +353,12 @@ export function adaptToFilm(item: ArchyContentItem, opts: AdaptContentOptions):
  */
 export function adaptToImage(item: ArchyContentItem, opts: AdaptContentOptions): ImageItem {
   const priceSats = paidPriceSats(item.access)
-  const locked = priceSats !== null
+  // 'own' items are served to the authenticated owner by the node's
+  // owner-bypass (`serve_content`) even when they're listed paid for
+  // buyers — the operator never pays for their own files, so never lock
+  // them (a locked card suppresses the playable URL, which is exactly the
+  // placeholder-only grid the operator reported).
+  const locked = opts.source !== 'own' && priceSats !== null
   const title = stripExtension(item.filename || '')
   return {
     id: item.id,
@@ -366,7 +376,12 @@ export function adaptToImage(item: ArchyContentItem, opts: AdaptContentOptions):
 
 export function adaptToSong(item: ArchyContentItem, opts: AdaptContentOptions): Song {
   const priceSats = paidPriceSats(item.access)
-  const locked = priceSats !== null
+  // 'own' items are served to the authenticated owner by the node's
+  // owner-bypass (`serve_content`) even when they're listed paid for
+  // buyers — the operator never pays for their own files, so never lock
+  // them (a locked card suppresses the playable URL, which is exactly the
+  // placeholder-only grid the operator reported).
+  const locked = opts.source !== 'own' && priceSats !== null
   const sourceType = SONG_SOURCE_TYPE[opts.source]
   return {
     id: item.id,
@@ -391,7 +406,12 @@ export function adaptToSong(item: ArchyContentItem, opts: AdaptContentOptions):
  * rather than a song. */
 export function adaptToPodcast(item: ArchyContentItem, opts: AdaptContentOptions): Podcast {
   const priceSats = paidPriceSats(item.access)
-  const locked = priceSats !== null
+  // 'own' items are served to the authenticated owner by the node's
+  // owner-bypass (`serve_content`) even when they're listed paid for
+  // buyers — the operator never pays for their own files, so never lock
+  // them (a locked card suppresses the playable URL, which is exactly the
+  // placeholder-only grid the operator reported).
+  const locked = opts.source !== 'own' && priceSats !== null
   const sourceType = PODCAST_SOURCE_TYPE[opts.source]
   return {
     id: item.id,