🐛 use dynamic protocol placeholder in gitea app.ini 🐛

- Replace hardcoded `PROTOCOL = http` with `REPLACE_SERVER_PROTO` in the `[server]` section
- Keeps PROTOCOL consistent with ROOT_URL, which already uses the placeholder
- Lets the entrypoint set the protocol at runtime instead of forcing http

AGENTS.md
rootfs/tmp/etc/gitea/app.ini

AGENTS.md

@@ -0,0 +1,3 @@
+# gitea
+
+Read `AI.md` and `IDEA.md` before acting on this project.