feat: bundle hanime-plugin and Deno JS runtime in Docker image

- Add PIP_BREAK_SYSTEM_PACKAGES=1 to install hanime-plugin via pip
- Install Deno JS runtime required by the plugin's extractors
- Document plugin setup and JS runtime requirement in README
- Note plugin support in feature list

README.md

@@ -21,6 +21,7 @@ Telegram bot for downloading media from any site yt-dlp supports.
 - Proxy support via HTTP_PROXY/HTTPS_PROXY env vars
 - Webhook and polling modes
 - SQLite database for persistence
+- yt-dlp plugin support — `hanime-plugin` bundled in Docker image
 
 ## Commands
 
@@ -75,6 +76,46 @@ make run-dev
 make docker-run
 ```
 
+The Docker image bundles the `hanime-plugin` and the Deno JS runtime for sites like
+hanime.tv, hstream.moe, and hentaihaven.com. See [yt-dlp plugins](#yt-dlp-plugins) for details.
+
+### Local (non-Docker)
+
+If running outside Docker, the bot uses whatever yt-dlp is in your PATH.
+Install plugins and a JS runtime as described below under [yt-dlp plugins](#yt-dlp-plugins).
+
+## yt-dlp plugins
+
+Some sites require yt-dlp plugins or a JavaScript runtime to work. The Docker image
+bundles these automatically; for local installs you need to set them up manually.
+
+### hanime-plugin
+
+Adds support for hanime.tv, hstream.moe, hentaihaven.com and others.
+
+```bash
+pip install hanime-plugin
+```
+
+The plugin requires a JavaScript runtime. [Deno](https://deno.com) is recommended:
+
+```bash
+# Linux/macOS
+curl -fsSL https://deno.land/install.sh | sh
+
+# Add to your shell config:
+export PATH="$HOME/.deno/bin:$PATH"
+```
+
+### Adding other plugins
+
+yt-dlp plugins are Python packages installed via pip. Most work without
+additional runtimes. Install any pip-installable yt-dlp plugin with:
+
+```bash
+pip install <plugin-name>
+```
+
 ## Development
 
 ```bash