Add sonarr/radarr/prowlarr fork repositories

Create the three arrstack source-fork repos (Postgres + stateless
multi-replica work). No branch protection yet so the initial upstream
mirror can be force-pushed; a follow-up PR adds protection + required
Woodpecker checks once CI exists.

config/git.unkin.net/unkin/repository/prowlarr.yaml

@@ -0,0 +1,5 @@
+description: "Private fork of Prowlarr: Postgres backend + stateless multi-replica for the arrstack"
+private: true
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"

config/git.unkin.net/unkin/repository/radarr.yaml

@@ -0,0 +1,5 @@
+description: "Private fork of Radarr: Postgres backend + stateless multi-replica for the arrstack"
+private: true
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"

config/git.unkin.net/unkin/repository/sonarr.yaml

@@ -0,0 +1,5 @@
+description: "Private fork of Sonarr: Postgres backend + stateless multi-replica for the arrstack"
+private: true
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"