Add package structure and resource path utilities

- Created langbot/ package with __init__.py and __main__.py entry point
- Added paths utility to find frontend and resource files from package installation
- Updated config loading to use resource paths
- Updated frontend serving to use resource paths
- Added MANIFEST.in for package data inclusion
- Updated pyproject.toml with build system and entry points

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

langbot/__init__.py

@@ -0,0 +1,3 @@
+"""LangBot - Easy-to-use global IM bot platform designed for LLM era"""
+
+__version__ = "4.4.1"

langbot/__main__.py

@@ -0,0 +1,106 @@
+"""LangBot entry point for package execution"""
+import asyncio
+import argparse
+import sys
+import os
+
+# ASCII art banner
+asciiart = r"""
+ _                   ___      _   
+| |   __ _ _ _  __ _| _ ) ___| |_ 
+| |__/ _` | ' \/ _` | _ \/ _ \  _|
+|____\__,_|_||_\__, |___/\___/\__|
+               |___/              
+
+⭐️ Open Source 开源地址: https://github.com/langbot-app/LangBot
+📖 Documentation 文档地址: https://docs.langbot.app
+"""
+
+
+async def main_entry(loop: asyncio.AbstractEventLoop):
+    """Main entry point for LangBot"""
+    parser = argparse.ArgumentParser(description='LangBot')
+    parser.add_argument(
+        '--standalone-runtime',
+        action='store_true',
+        help='Use standalone plugin runtime / 使用独立插件运行时',
+        default=False,
+    )
+    parser.add_argument('--debug', action='store_true', help='Debug mode / 调试模式', default=False)
+    args = parser.parse_args()
+
+    if args.standalone_runtime:
+        from pkg.utils import platform
+
+        platform.standalone_runtime = True
+
+    if args.debug:
+        from pkg.utils import constants
+
+        constants.debug_mode = True
+
+    print(asciiart)
+
+    # Check dependencies
+    from pkg.core.bootutils import deps
+
+    missing_deps = await deps.check_deps()
+
+    if missing_deps:
+        print('以下依赖包未安装，将自动安装，请完成后重启程序：')
+        print(
+            'These dependencies are missing, they will be installed automatically, please restart the program after completion:'
+        )
+        for dep in missing_deps:
+            print('-', dep)
+        await deps.install_deps(missing_deps)
+        print('已自动安装缺失的依赖包，请重启程序。')
+        print('The missing dependencies have been installed automatically, please restart the program.')
+        sys.exit(0)
+
+    # Check configuration files
+    from pkg.core.bootutils import files
+
+    generated_files = await files.generate_files()
+
+    if generated_files:
+        print('以下文件不存在，已自动生成：')
+        print('Following files do not exist and have been automatically generated:')
+        for file in generated_files:
+            print('-', file)
+
+    from pkg.core import boot
+
+    await boot.main(loop)
+
+
+def main():
+    """Main function to be called by console script entry point"""
+    # Check Python version
+    if sys.version_info < (3, 10, 1):
+        print('需要 Python 3.10.1 及以上版本，当前 Python 版本为：', sys.version)
+        input('按任意键退出...')
+        print('Your Python version is not supported. Please exit the program by pressing any key.')
+        sys.exit(1)
+
+    # Set up the working directory
+    # When installed as a package, we need to handle the working directory differently
+    # We'll create data directory in current working directory if not exists
+    if not os.path.exists('data'):
+        print('Creating data directory in current working directory...')
+        print('在当前工作目录创建 data 目录...')
+        os.makedirs('data', exist_ok=True)
+
+    loop = asyncio.new_event_loop()
+
+    try:
+        loop.run_until_complete(main_entry(loop))
+    except KeyboardInterrupt:
+        print('\n正在退出...')
+        print('Exiting...')
+    finally:
+        loop.close()
+
+
+if __name__ == '__main__':
+    main()