build(release): fix gitea config key (gitea_urls) and pin owner/name

giteaurls is not a goreleaser key — the correct one is gitea_urls. The
scp-style origin remote (gitea@host:owner/repo.git) is also an
unreliable source for owner/name derivation, so release.gitea pins
them explicitly.

.goreleaser.yaml

@@ -4,12 +4,21 @@ project_name: agent-lib
 
 # Releases gehen an die eigene Gitea-Instanz (NICHT GitHub):
 #   GITEA_TOKEN=<token mit repository-write> als Umgebungsvariable
-# Repo/Owner werden aus dem origin-Remote abgeleitet
-# (gitea@code.m3ta.dev:m3tam3re/agent-lib.git).
-giteaurls:
+# Owner/Name sind explizit gesetzt, weil das SCP-Stil-Remote
+# (gitea@code.m3ta.dev:m3tam3re/agent-lib.git) fuer die automatische
+# Ableitung unzuverlaessig ist.
+gitea_urls:
   api: https://code.m3ta.dev/api/v1
   download: https://code.m3ta.dev
 
+release:
+  draft: false
+  prerelease: auto
+  mode: append
+  gitea:
+    owner: m3tam3re
+    name: agent-lib
+
 before:
   hooks:
     - go mod tidy
@@ -45,11 +54,6 @@ archives:
     # .../releases/download/<tag>/agent-lib_<os>_<arch>.<ext>
     name_template: "{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}"
 
-release:
-  draft: false
-  prerelease: auto
-  mode: append
-
 changelog:
   sort: asc
   filters: