feat(inspircd): configure proper logging directory

- Ensure log directory exists via systemd LogsDirectory
- Update log path to use absolute path /var/log/inspircd/ircd.log

nixos/viridian/services/inspircd/default.nix

@@ -4,6 +4,9 @@
     config = builtins.readFile ./inspircd.conf;
   };
 
+  # Ensure log directory exists
+  systemd.services.inspircd.serviceConfig.LogsDirectory = "inspircd";
+
   environment.etc = {
     "inspircd/inspircd.motd".source = ./inspircd.motd;
   };

nixos/viridian/services/inspircd/inspircd.conf

@@ -589,7 +589,7 @@
 # The following log tag is highly default and uncustomised. It is recommended you
 # sort out your own log tags. This is just here so you get some output.
 
-<log method="file" type="* -USERINPUT -USEROUTPUT" level="default" target="ircd.log">
+<log method="file" type="* -USERINPUT -USEROUTPUT" level="default" target="/var/log/inspircd/ircd.log">
 
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