Show an IRC listener user what their session sends from other clients (closes #179)

The relay dropped every PRIVMSG, NOTICE, JOIN, PART, NICK, QUIT, TOPIC,
MODE and KICK sent under the connection's own nick, so an IRC listener
connection never saw what its session did from another client. The
relay now drops nothing by nick. Instead, the service methods that fan
out a user's own command take the client whose queue to skip: the IRC
listener passes its own client, which has already written the echo, and
the HTTP API passes 0. Channel messages and PARTs now also go to the
sender's own session, so the HTTP handler no longer queues the
channel-message echo itself, SendChannelMessage no longer returns the
message's row ID, and neoirc-cli ignores the PART event for its own
part, which it has already shown.

Model: opus-5-5

internal/ircserver/relay.go

@@ -198,15 +198,6 @@ func (c *Conn) deliverTextMessage(
 	from := msg.From
 	target := msg.To
 
-	c.mu.Lock()
-	nick := c.nick
-	c.mu.Unlock()
-
-	// Don't echo our own messages back.
-	if from == nick {
-		return
-	}
-
 	prefix := from
 	if !strings.Contains(prefix, "!") {
 		prefix = from + "!" + from + "@*"
@@ -219,16 +210,6 @@ func (c *Conn) deliverTextMessage(
 
 // deliverJoin sends a JOIN notification.
 func (c *Conn) deliverJoin(msg *db.IRCMessage) {
-	c.mu.Lock()
-	nick := c.nick
-	c.mu.Unlock()
-
-	// Don't echo our own JOINs (we already sent them
-	// during joinChannel).
-	if msg.From == nick {
-		return
-	}
-
 	prefix := msg.From + "!" + msg.From + "@*"
 	channel := msg.To
 
@@ -237,14 +218,6 @@ func (c *Conn) deliverJoin(msg *db.IRCMessage) {
 
 // deliverPart sends a PART notification.
 func (c *Conn) deliverPart(msg *db.IRCMessage, text string) {
-	c.mu.Lock()
-	nick := c.nick
-	c.mu.Unlock()
-
-	if msg.From == nick {
-		return
-	}
-
 	prefix := msg.From + "!" + msg.From + "@*"
 	channel := msg.To
 
@@ -262,14 +235,6 @@ func (c *Conn) deliverNickChange(
 	msg *db.IRCMessage,
 	newNick string,
 ) {
-	c.mu.Lock()
-	nick := c.nick
-	c.mu.Unlock()
-
-	if msg.From == nick {
-		return
-	}
-
 	prefix := msg.From + "!" + msg.From + "@*"
 
 	c.send(FormatMessage(prefix, "NICK", newNick))
@@ -280,14 +245,6 @@ func (c *Conn) deliverQuitMsg(
 	msg *db.IRCMessage,
 	text string,
 ) {
-	c.mu.Lock()
-	nick := c.nick
-	c.mu.Unlock()
-
-	if msg.From == nick {
-		return
-	}
-
 	prefix := msg.From + "!" + msg.From + "@*"
 
 	if text != "" {
@@ -304,15 +261,6 @@ func (c *Conn) deliverTopicChange(
 	msg *db.IRCMessage,
 	text string,
 ) {
-	c.mu.Lock()
-	nick := c.nick
-	c.mu.Unlock()
-
-	// handleTopic already echoed our own topic change.
-	if msg.From == nick {
-		return
-	}
-
 	prefix := msg.From + "!" + msg.From + "@*"
 	channel := msg.To
 
@@ -324,15 +272,6 @@ func (c *Conn) deliverKickMsg(
 	msg *db.IRCMessage,
 	text string,
 ) {
-	c.mu.Lock()
-	nick := c.nick
-	c.mu.Unlock()
-
-	// handleKick already echoed our own kick.
-	if msg.From == nick {
-		return
-	}
-
 	prefix := msg.From + "!" + msg.From + "@*"
 	channel := msg.To
 
@@ -403,15 +342,6 @@ func (c *Conn) deliverMode(
 		return
 	}
 
-	c.mu.Lock()
-	nick := c.nick
-	c.mu.Unlock()
-
-	// applyChannelModes already echoed our own mode change.
-	if msg.From == nick {
-		return
-	}
-
 	prefix := msg.From + "!" + msg.From + "@*"
 
 	params := slices.Concat(