repository: add jellyfin-ha-src source fork

Add the jellyfin-ha-src Gitea repository that carries the HA source fork of
ZoltyMat/jellyfin-ha with local patches, replacing the direct upstream clone
in the build pipeline.

Declare the repository as public with a main default branch and
delete-branch-after-merge enabled. Leave branch protection unset so the
initial fork seed can push the pinned upstream tree and a pristine upstream
ref directly to main; protection is added in a follow-up change once the fork
is seeded.

config/git.unkin.net/unkin/repository/jellyfin-ha-src.yaml

@@ -0,0 +1,4 @@
+description: "Source fork of ZoltyMat/jellyfin-ha carrying HA patches"
+private: false
+default_branch: "main"
+default_delete_branch_after_merge: true