chore: remove duplicate copies of the site, download center and installers (WS-C)

The landing page, download pages, invite page, assetlinks and installers
existed in two or three places; only site/ and the Forgejo feed are served.

- apps/api-server/wwwroot: delete the stale site build, download/invite
  pages, .well-known copy, legacy static admin and 1.0.0 binaries. The API
  no longer serves static files (UseStaticFiles/fallbacks and the apk/zip
  blocker removed); the Next admin is the only admin UI.
- Delete 19 tracked installers/packages (~568 MiB) under site/public/releases,
  apps/web/public/releases and wwwroot/releases; .gitignore blocks them.
- apps/web: delete the download/releases pages, desktop-release.ts, the
  download.html and assetlinks copies, and the accept-invite page (invites
  are only issued to the site's /accept-invite/). e2e specs call the /app
  base path and check the /download redirect instead.
- scripts: delete the retired release/NAS site scripts, drop the web target
  from sync-version, and check assetlinks in site/public only.
- Delete the unused Dockerfile.admin (apps/admin/Dockerfile is used).

Policy: docs/REFACTOR_POLICY.md Wave 3, W3-5 and W3-6.

apps/web/src/lib/desktop-release.ts

@@ -1,27 +0,0 @@
-// apps/web/src/lib/desktop-release.ts
-// 데스크톱 공식 릴리스 계약 SSOT.
-//
-// 설치 파일은 canonical Forgejo feed에서만 배포한다. 웹/사이트 빌드 산출물에는
-// 설치 바이너리가 포함되지 않으므로 `/releases/...` 로컬 경로는 배포 환경에서 404다.
-
-export const DESKTOP_VERSION = '1.6.0'
-
-/** 릴리스 게시일. `release/product-version.json`의 releaseDate와 같아야 한다. */
-export const DESKTOP_RELEASE_DATE = '2026-09-24'
-
-const FORGEJO_ORIGIN = 'https://git.chanpaca.net'
-const FORGEJO_OWNER = 'yunchan'
-const FORGEJO_REPO = 'd3ro-voice'
-
-/** Registry 안에서 항상 최신 설치 자산을 가리키는 feed 루트 (updater와 동일). */
-export const DESKTOP_FEED_URL = `${FORGEJO_ORIGIN}/api/packages/${FORGEJO_OWNER}/generic/${FORGEJO_REPO}/latest`
-
-export const DESKTOP_WINDOWS_INSTALLER_FILENAME = `D3RO-Voice-Setup-${DESKTOP_VERSION}-x64.exe`
-
-export const DESKTOP_WINDOWS_INSTALLER_URL = `${DESKTOP_FEED_URL}/${DESKTOP_WINDOWS_INSTALLER_FILENAME}`
-
-/** Forgejo Release 허브 (릴리스 노트 + 자산 첨부). */
-export const DESKTOP_RELEASE_HUB_URL = `${FORGEJO_ORIGIN}/${FORGEJO_OWNER}/${FORGEJO_REPO}/releases/tag/v${DESKTOP_VERSION}`
-
-/** Release 자산 목록 (버전 아카이브). */
-export const DESKTOP_RELEASES_URL = `${FORGEJO_ORIGIN}/${FORGEJO_OWNER}/${FORGEJO_REPO}/releases`