feat: add plugin dependency pipeline and HTML rendering service

- Implemented a new dependency pipeline for plugins to manage Python package dependencies, including conflict detection and automatic installation of missing dependencies.
- Introduced an HTML rendering service that utilizes existing browsers to render HTML content as PNG images, with support for various configurations and error handling.

src/plugin_runtime/__init__.py

@@ -20,5 +20,8 @@ ENV_HOST_VERSION = "MAIBOT_HOST_VERSION"
 ENV_EXTERNAL_PLUGIN_IDS = "MAIBOT_EXTERNAL_PLUGIN_IDS"
 """Runner 启动时可视为已满足的外部插件依赖版本映射（JSON 对象）"""
 
+ENV_BLOCKED_PLUGIN_REASONS = "MAIBOT_BLOCKED_PLUGIN_REASONS"
+"""Runner 启动时收到的拒绝加载插件原因映射（JSON 对象）"""
+
 ENV_GLOBAL_CONFIG_SNAPSHOT = "MAIBOT_GLOBAL_CONFIG_SNAPSHOT"
 """Runner 启动时注入的全局配置快照（JSON 对象）"""