modules: move all per-module state/config out of server.rs/config.rs into own files

src/modules/profilelink.rs

@@ -0,0 +1,17 @@
+//! profileLink — InspIRCd `m_profileLink`. Adds a profile URL to WHOIS for
+//! logged-in users from `profilelink_baseurl = <url>`. Config-driven; nothing
+//! lives on `Server`.
+
+use crate::server::Server;
+
+/// The WHOIS profile line for `account`, or `None` when unconfigured.
+pub fn line(s: &Server, account: &Option<String>) -> Option<String> {
+    let base = s.conf("profilelink_baseurl")?;
+    if base.is_empty() {
+        return None;
+    }
+    Some(match account {
+        Some(acct) => format!("Profil: {base}{acct}"),
+        None => "Profile: The user is not logged in or the account is not registered.".to_string(),
+    })
+}