chore: import upstream snapshot with attribution

plugins/webhook.lua

@@ -0,0 +1,29 @@
+-- webhook.lua — POST track info to a URL on every track change.
+--
+-- Configure the URL in config.toml:
+--   [plugins.webhook]
+--   url = "https://example.com/hook"
+
+local p = plugin.register({
+    name = "webhook",
+    type = "hook",
+    description = "POST track info to a webhook URL",
+})
+
+local url = p:config("url")
+
+p:on("track.change", function(track)
+    if not url then return end
+    local body, status = cliamp.http.post(url, {
+        json = {
+            title  = track.title,
+            artist = track.artist,
+            album  = track.album,
+            genre  = track.genre,
+            path   = track.path,
+        }
+    })
+    if status and status >= 400 then
+        cliamp.log.warn("webhook returned " .. tostring(status))
+    end
+end)