build: the organisation on code.halkyon.app is halkyon-days

ADR 0045, D12, step 1: project-halkyon was renamed halkyon-days, its
repositories keeping their names. Every URL naming it moves along: the
servers' source-code links, which the AGPL requires, and their tests;
the forks in the pubspecs and the lock (appflowy-editor, pure-zstd,
serverpod-offline-sync); the snaps, the F-Droid listings and the
release configurations; the docs. The curator's credit for the
alphabets names the repository by its name since ADR 0015, halkyon,
rather than halkyon_learn. Forgejo redirects the old addresses until
the name is taken again.

ADRs 0015 and 0039 keep the name they were written with, and the local
folders theirs.

halkyon_editor's gen-l10n caches under build/, committed before its
.gitignore named the folder, are no longer tracked.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

pubspec.lock

@@ -71,7 +71,7 @@ packages:
       path: "."
       ref: "81c3006c74e789ed2e470b8612529541b358fd26"
       resolved-ref: "81c3006c74e789ed2e470b8612529541b358fd26"
-      url: "https://code.halkyon.app/project-halkyon/appflowy-editor.git"
+      url: "https://code.halkyon.app/halkyon-days/appflowy-editor.git"
     source: git
     version: "6.1.0"
   archive:
@@ -1689,7 +1689,7 @@ packages:
       path: "."
       ref: "596b63d5741d479073fbfc78377cc7dbdd342da3"
       resolved-ref: "596b63d5741d479073fbfc78377cc7dbdd342da3"
-      url: "https://code.halkyon.app/project-halkyon/pure-zstd.git"
+      url: "https://code.halkyon.app/halkyon-days/pure-zstd.git"
     source: git
     version: "1.0.0"
   qr:
@@ -1906,7 +1906,7 @@ packages:
       path: "packages/serverpod_offline_sync"
       ref: "845fb557db3e21cf78b152f9e39ba6a26947bab9"
       resolved-ref: "845fb557db3e21cf78b152f9e39ba6a26947bab9"
-      url: "https://code.halkyon.app/project-halkyon/serverpod-offline-sync.git"
+      url: "https://code.halkyon.app/halkyon-days/serverpod-offline-sync.git"
     source: git
     version: "0.0.10"
   serverpod_offline_sync_client: