fix: correct Gitea custom directory mount path

Change from ./dev/custom to ./custom since compose.yaml is in dev/ directory

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Co-Authored-By: Claude <noreply@anthropic.com>

dev/compose.yaml

@@ -11,7 +11,7 @@ services:
       - gitea_config:/etc/gitea
       - /etc/timezone:/etc/timezone:ro
       - /etc/localtime:/etc/localtime:ro
-      - ./dev/custom:/data/gitea/custom:ro
+      - ./custom:/data/gitea/custom:ro
     environment:
       TZ: ${TIMEZONE:-Europe/Berlin}
       USER_UID: 1000