Split ReportServ into one file per command

REPORT/LIST/VIEW/CLOSE/DEL each move to their own file; the shared oper
guard stays in lib.rs beside the dispatcher. No behaviour change.

modules/reportserv/src/report.rs

@@ -0,0 +1,19 @@
+use fedserv_api::{Sender, ServiceCtx, Store};
+
+// REPORT <nick|#channel> <reason>: file an abuse report. Rate-limited.
+pub fn handle(me: &str, from: &Sender, rest: &[&str], ctx: &mut ServiceCtx, db: &mut dyn Store) {
+    let Some((&target, reason_words)) = rest.split_first() else {
+        ctx.notice(me, from.uid, "Syntax: REPORT <nick|#channel> <reason>");
+        return;
+    };
+    if reason_words.is_empty() {
+        ctx.notice(me, from.uid, "Please say what the problem is: REPORT <nick|#channel> <reason>");
+        return;
+    }
+    let reason = reason_words.join(" ");
+    let reporter = from.account.unwrap_or(from.nick);
+    match db.report_file(reporter, target, &reason) {
+        Some(id) => ctx.notice(me, from.uid, format!("Thanks — your report (\x02#{id}\x02) about \x02{target}\x02 has been sent to the staff.")),
+        None => ctx.notice(me, from.uid, "You just filed a report — please wait a moment before filing another."),
+    }
+}