chore: Add PyPI package support for uvx/pip installation (#1764)

* Initial plan

* 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>

* Add PyPI publishing workflow and update license

- Created GitHub Actions workflow to build frontend and publish to PyPI
- Added license field to pyproject.toml to fix deprecation warning
- Updated .gitignore to exclude build artifacts
- Tested package building successfully

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

* Add PyPI installation documentation

- Created PYPI_INSTALLATION.md with detailed installation and usage instructions
- Updated README.md to feature uvx/pip installation as recommended method
- Updated README_EN.md with same changes for English documentation

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

* Address code review feedback

- Made package-data configuration more specific to langbot package only
- Improved path detection with caching to avoid repeated file I/O
- Removed sys.path searching which was incorrect for package data
- Removed interactive input() call for non-interactive environment compatibility
- Simplified error messages for version check

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

* Fix code review issues

- Use specific exception types instead of bare except
- Fix misleading comments about directory levels
- Remove redundant existence check before makedirs with exist_ok=True
- Use context manager for file opening to ensure proper cleanup

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

* Simplify package configuration and document behavioral differences

- Removed redundant package-data configuration, relying on MANIFEST.in
- Added documentation about behavioral differences between package and source installation
- Clarified that include-package-data=true uses MANIFEST.in for data files

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

* chore: update pyproject.toml

* chore: try pack templates in langbot/

* chore: update

* chore: update

* chore: update

* chore: update

* chore: update

* chore: adjust dir structure

* chore: fix imports

* fix: read default-pipeline-config.json

* fix: read default-pipeline-config.json

* fix: tests

* ci: publish pypi

* chore: bump version 4.6.0-beta.1 for testing

* chore: add templates/**

* fix: send adapters and requesters icons

* chore: bump version 4.6.0b2 for testing

* chore: add platform field for docker-compose.yaml

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>
Co-authored-by: Junyan Qin <rockchinq@gmail.com>

src/langbot/pkg/core/bootutils/deps.py

@@ -0,0 +1,79 @@
+import pip
+import os
+from ...utils import pkgmgr
+
+# Check dependencies to prevent users from not installing
+# Left is the import name, right is the dependency name
+required_deps = {
+    'requests': 'requests',
+    'openai': 'openai',
+    'anthropic': 'anthropic',
+    'colorlog': 'colorlog',
+    'aiocqhttp': 'aiocqhttp',
+    'botpy': 'qq-botpy-rc',
+    'PIL': 'pillow',
+    'nakuru': 'nakuru-project-idk',
+    'tiktoken': 'tiktoken',
+    'yaml': 'pyyaml',
+    'aiohttp': 'aiohttp',
+    'psutil': 'psutil',
+    'async_lru': 'async-lru',
+    'ollama': 'ollama',
+    'quart': 'quart',
+    'quart_cors': 'quart-cors',
+    'sqlalchemy': 'sqlalchemy[asyncio]',
+    'aiosqlite': 'aiosqlite',
+    'aiofiles': 'aiofiles',
+    'aioshutil': 'aioshutil',
+    'argon2': 'argon2-cffi',
+    'jwt': 'pyjwt',
+    'Crypto': 'pycryptodome',
+    'lark_oapi': 'lark-oapi',
+    'discord': 'discord.py',
+    'cryptography': 'cryptography',
+    'gewechat_client': 'gewechat-client',
+    'dingtalk_stream': 'dingtalk_stream',
+    'dashscope': 'dashscope',
+    'telegram': 'python-telegram-bot',
+    'certifi': 'certifi',
+    'mcp': 'mcp',
+    'sqlmodel': 'sqlmodel',
+    'telegramify_markdown': 'telegramify-markdown',
+    'slack_sdk': 'slack_sdk',
+    'asyncpg': 'asyncpg',
+}
+
+
+async def check_deps() -> list[str]:
+    global required_deps
+
+    missing_deps = []
+    for dep in required_deps:
+        try:
+            __import__(dep)
+        except ImportError:
+            missing_deps.append(dep)
+    return missing_deps
+
+
+async def install_deps(deps: list[str]):
+    global required_deps
+
+    for dep in deps:
+        pip.main(['install', required_deps[dep]])
+
+
+async def precheck_plugin_deps():
+    print('[Startup] Prechecking plugin dependencies...')
+
+    # Only execute plugin dependency installation when the plugins directory exists
+    if os.path.exists('plugins'):
+        for dir in os.listdir('plugins'):
+            subdir = os.path.join('plugins', dir)
+            if not os.path.isdir(subdir):
+                continue
+            if 'requirements.txt' in os.listdir(subdir):
+                pkgmgr.install_requirements(
+                    os.path.join(subdir, 'requirements.txt'),
+                    extra_params=[],
+                )