Add PyPI package support for uvx/pip installation

[Copilot]

概述 / Overview

实现了 LangBot 的 PyPI 包发布支持，用户可通过 uvx langbot 或 pip install langbot 一键安装运行，无需克隆仓库或手动编译前端。

Implemented PyPI package distribution for LangBot. Users can now install and run via uvx langbot or pip install langbot without cloning the repository or building the frontend manually.

核心变更 / Core Changes

• 包结构 / Package Structure

  • Created langbot/ package with __main__.py entry point for console script execution
  • Added MANIFEST.in to bundle frontend, templates, and resources in distribution
  • Updated pyproject.toml with build system config and langbot console script entry point

• 资源路径处理 / Resource Path Resolution

  • Implemented pkg/utils/paths.py to locate resources in both source and installed package environments
  • Updated all config loaders (JSON/YAML) and frontend serving to use path utility
  • Cached source install detection to minimize file I/O

• CI/CD

  • Added .github/workflows/publish-to-pypi.yml to build frontend and publish to PyPI on release
  • Workflow builds frontend with Node.js, packages with pre-built assets, publishes via trusted publishing

• 文档 / Documentation

  • Created docs/PYPI_INSTALLATION.md with installation and usage instructions
  • Updated README.md and README_EN.md to feature uvx/pip as recommended installation method

使用示例 / Usage Example

# Quick start with uvx (no installation)
uvx langbot

# Or install and run
pip install langbot
langbot --debug

行为差异 / Behavioral Changes

• Creates data/ directory in current working directory (not tied to project root)
• Non-interactive Python version check (exits immediately vs prompting for input)
• Frontend pre-built and bundled (no manual npm build required)

统计 / Statistics

16 files changed: +496 lines, -12 lines

检查清单 / Checklist

PR 作者完成 / For PR author

• 阅读仓库贡献指引了吗？ / Have you read the contribution guide?
• 与项目所有者沟通过了吗？ / Have you communicated with the project maintainer?
• 我确定已自行测试所作的更改，确保功能符合预期。 / I have tested the changes and ensured they work as expected.

项目维护者完成 / For project maintainer

• 相关 issues 链接了吗？ / Have you linked the related issues?
• 配置项写好了吗？迁移写好了吗？生效了吗？ / Have you written the configuration items? Have you written the migration? Has it taken effect?
• 依赖加到 pyproject.toml 和 core/bootutils/deps.py 了吗 / Have you added the dependencies to pyproject.toml and core/bootutils/deps.py?
• 文档编写了吗？ / Have you written the documentation?

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• astral.sh
  • Triggering command: curl -LsSf REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

langbot目前只有docker和下载源码部署，在下载源码的方式中，用户需要下载release中编译好了前端的源码包，解压，再使用uv sync安装依赖，然后才能使用uv run main.py来启动；很不方便；

而uv推出了一个uvx工具，跟npx很像，能自动下载并启动python包；我们已经抢占了 langbot 这个包名，在pypi，请你帮我做好这些适配，把langbot目录做成一个可发行的python包，其中需要包含编译好的前端文件（每次发版的时候，通过github actions工作流编译并上传pypi）；

请你在开始工作之前，认真阅读uv的文档；

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[codecov]

Codecov Report

❌ Patch coverage is 6.66667% with 84 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/utils/paths.py	0.00%	38 Missing ⚠️
pkg/config/impls/json.py	15.38%	11 Missing ⚠️
pkg/config/impls/yaml.py	15.38%	11 Missing ⚠️
pkg/core/stages/load_config.py	0.00%	10 Missing ⚠️
pkg/api/http/service/pipeline.py	33.33%	4 Missing ⚠️
pkg/core/app.py	0.00%	3 Missing ⚠️
pkg/core/bootutils/files.py	0.00%	3 Missing ⚠️
pkg/api/http/controller/main.py	0.00%	2 Missing ⚠️
pkg/config/manager.py	0.00%	2 Missing ⚠️

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