Plugin Structure:
  exports.init = function(api) { ... }   — Called when plugin loads
  exports.cleanup = function() { ... }   — Called when plugin unloads

Core Objects:
  api.server        — IRCServer instance
  api.config        — ConfigManager instance
  api.db            — Database instance (SQLite)
  api.logger        — Logger (.info, .warn, .error, .debug)

Client Methods:
  api.sendToClient(nick, rawLine)    — Send raw IRC line to client
  api.notice(nick, text)             — Send NOTICE to a client
  api.getClients()                   — Map of all connected clients
  api.broadcastToOpers(msg)          — NOTICE to all IRC operators

Channel Methods:
  api.getChannel(name)               — Get Channel object by name
  api.getChannels()                  — Map of all channels

Services:
  api.getService('NickServ')         — Access NickServ/ChanServ/etc.

Commands & Events:
  api.addCommand(cmd, handler)       — Register IRC command (auto-cleaned)
    handler: (client, params) => { }
  api.on(event, handler)             — Listen for events (auto-cleaned)

Timers:
  api.setInterval(fn, ms)            — Recurring (auto-cleaned on unload)
  api.setTimeout(fn, ms)             — One-shot (auto-cleaned on unload)

Events:
  channelJoin     (client, channel)
  channelPart     (client, channel, reason)
  channelMessage  (client, channel, cmd, text)
  topicChange     (client, channel, newTopic)
  clientQuit      (client, reason)
  nickChange      (client, oldNick, newNick)
  serviceMessage  (client, serviceName, cmd, text)

Channel message example (bot command):
  api.on('channelMessage', (client, channel, cmd, text) => {
    if (text && text.startsWith('!hello')) {
      const msg = ':MyBot!bot@services PRIVMSG ' + channel.name + ' :Hello, ' + client.nick + '!';
      for (const [, m] of channel.members) {
        if (m.client && m.client.socket) m.client.send(msg);
      }
    }
  });