Config editor, host networking, whitelist RCON

- Config file editor at /instances/{id}/config (browse & edit config/ files)
- Host networking for Docker container (fixes WireGuard MTU DNS issues)
- Whitelist changes applied live via RCON instead of stopping the server
- Config edit handler detects which fields changed: whitelist → RCON,
  other settings → restart container
- walk_dir simplified (removed unused root param)
- import_world uses if-let instead of never-looping while-let
- docker-compose.yml updated as reference template

1 files changed, 6 insertions, 0 deletions

diff --git a/src/sanitize.rs b/src/sanitize.rs
index f251131..19c7045 100644
--- a/src/sanitize.rs
+++ b/src/sanitize.rs
@@ -136,6 +136,12 @@ pub fn instance_dir(server_dir: &Path, instance_name: &str) -> Option<PathBuf> {
     Some(server_dir.join("instances").join(&safe))
 }
 
+/// Build a safe path to the instance's config/ directory.
+pub fn instance_config_dir(server_dir: &Path, instance_name: &str) -> Option<PathBuf> {
+    let data = instance_data_dir(server_dir, instance_name)?;
+    Some(data.join("config"))
+}
+
 /// Validate that a backup filename does not contain path traversal.
 pub fn sanitize_backup_filename(raw: &str) -> Option<String> {
     let trimmed = raw.trim();