Group the module crates under modules/

The service pseudo-clients and the ircd protocol link sat flat at the
repo root, mixed in with the daemon core and the SDK. Move them all
under modules/ so the tree separates concerns cleanly: the daemon in
src/, the SDK every module links against in api/, and the loadable
modules — the pseudo-clients plus the protocol link — in modules/.

Workspace members, the daemon's per-crate dependency paths, and each
module's api path are updated to match; the docs follow. No code change.

modules/botserv/src/assign.rs

@@ -0,0 +1,45 @@
+use fedserv_api::{Priv, Sender, ServiceCtx, Store};
+
+// ASSIGN <#channel> <bot> / UNASSIGN <#channel>: put a bot in a channel (or take
+// it out). Channel founder only (or a services admin).
+pub fn handle(me: &str, from: &Sender, args: &[&str], ctx: &mut ServiceCtx, db: &mut dyn Store, assigning: bool) {
+    let Some(&chan) = args.get(1) else {
+        let syntax = if assigning { "Syntax: ASSIGN <#channel> <bot>" } else { "Syntax: UNASSIGN <#channel>" };
+        ctx.notice(me, from.uid, syntax);
+        return;
+    };
+    if !super::require_channel_admin(me, from, chan, ctx, db) {
+        return;
+    }
+    // NOBOT reserves (un)assignment for services operators.
+    let is_admin = from.privs.has(Priv::Admin);
+    if !is_admin && db.channel(chan).is_some_and(|c| c.nobot) {
+        ctx.notice(me, from.uid, format!("\x02{chan}\x02 is set \x02NOBOT\x02 — only a services operator can change its bot."));
+        return;
+    }
+    if !assigning {
+        match db.unassign_bot(chan) {
+            Ok(true) => ctx.notice(me, from.uid, format!("The bot has left \x02{chan}\x02.")),
+            Ok(false) => ctx.notice(me, from.uid, format!("\x02{chan}\x02 has no bot assigned.")),
+            Err(_) => ctx.notice(me, from.uid, "Sorry, that didn't work. Please try again in a moment."),
+        }
+        return;
+    }
+    let Some(&bot) = args.get(2) else {
+        ctx.notice(me, from.uid, "Syntax: ASSIGN <#channel> <bot>");
+        return;
+    };
+    let Some(target) = db.bots().into_iter().find(|b| b.nick.eq_ignore_ascii_case(bot)) else {
+        ctx.notice(me, from.uid, format!("There's no bot named \x02{bot}\x02. See \x02BOT LIST\x02."));
+        return;
+    };
+    if target.private && !is_admin {
+        ctx.notice(me, from.uid, format!("Bot \x02{}\x02 is private — only a services operator can assign it.", target.nick));
+        return;
+    }
+    let botnick = target.nick;
+    match db.assign_bot(chan, &botnick) {
+        Ok(()) => ctx.notice(me, from.uid, format!("Bot \x02{botnick}\x02 is now assigned to \x02{chan}\x02.")),
+        Err(_) => ctx.notice(me, from.uid, "Sorry, that didn't work. Please try again in a moment."),
+    }
+}