refactor(danmuku): [PKG-DANMUKU-03] own input loading parsing and configuration

packages/artplayer-plugin-danmuku/README.md

@@ -6,6 +6,28 @@ Danmuku plugin for ArtPlayer
 
 [https://artplayer.org](https://artplayer.org/?libs=./uncompiled/artplayer-plugin-danmuku/index.js&example=danmuku)
 
+## Loading and configuration
+
+`plugin.load()` reloads the configured input and replaces the queue after input
+succeeds. `plugin.load(input)` appends; concurrent append operations remain
+independent. A newer replacement supersedes an unfinished older replacement.
+Destroy cancels pending loads and prevents late queue changes. Cancelled loads
+resolve to the same internal Danmuku instance as successful loads, without a
+late `loaded` or `error` event.
+
+Fetch or response-text failures emit `artplayerPluginDanmuku:error` once and
+reject the corresponding public `load()` Promise. Initial automatic loading
+observes its rejection and logs a warning. XML Worker startup/runtime failures
+use the existing parser locally and release Worker/Blob resources.
+
+Explicit `time: 0` is preserved. A replacement callback passed to `config()`
+takes effect, and invalid configuration leaves the current option intact.
+Existing method return identities, getters, input normalization and XML fields
+remain compatible. Configuration changes do not automatically reload data.
+
+See [ARCHITECTURE.md](./ARCHITECTURE.md) for module ownership, compatibility
+constraints, tests and the remaining staged TypeScript migration.
+
 ## License
 
 MIT © Harvey Zhao