refactor(ui): improve modularity, lifecycle, and types

[qwqcode]

• Introduce a service dependency container for better management (#1006).
  • Replace original services definitions with provide and inject methods.
  • Recommend calling inject at the beginning of ArtalkPlugin to explicitly inject required dependencies.
• Replace load with mount for improved lifecycle handling.
  • Track local config.
  • Fix potential language setting not working issue. (Fixes #973)
• Refine Type definitions for clarity and maintainability.
  • See TypeDoc for updates.
• Enhance config logic with ConfigManager.
  • Deprecate ctx.conf and ctx.$root; use getConf() and getEl() instead.
  • Update client default config settings. (Fixes #1001)
• Improve event handling with EventManager refactor.
• Update plugin and editor architecture for greater flexibility.
  • Further eliminate global variables and avoid directly passing the Context interface as a function parameter. Instead, use more explicit and specific types and parameters.
• Remove deprecated and redundant code for a cleaner structure.

BREAKING CHANGE: This update changes the UI client's export Types. Although we aim to maintain backward compatibility, it may still affect downstream UI programs. Please refer to the TypeDoc.