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>

tests/unit_tests/storage/test_storage_provider_selection.py

@@ -4,9 +4,9 @@ Tests for storage manager and provider selection
 
 import pytest
 from unittest.mock import Mock, AsyncMock, patch
-from pkg.storage.mgr import StorageMgr
-from pkg.storage.providers.localstorage import LocalStorageProvider
-from pkg.storage.providers.s3storage import S3StorageProvider
+from langbot.pkg.storage.mgr import StorageMgr
+from langbot.pkg.storage.providers.localstorage import LocalStorageProvider
+from langbot.pkg.storage.providers.s3storage import S3StorageProvider
 
 
 class TestStorageProviderSelection:
@@ -34,11 +34,7 @@ class TestStorageProviderSelection:
         # Mock application
         mock_app = Mock()
         mock_app.instance_config = Mock()
-        mock_app.instance_config.data = {
-            'storage': {
-                'use': 'local'
-            }
-        }
+        mock_app.instance_config.data = {'storage': {'use': 'local'}}
         mock_app.logger = Mock()
 
         storage_mgr = StorageMgr(mock_app)
@@ -62,8 +58,8 @@ class TestStorageProviderSelection:
                     'access_key_id': 'test_key',
                     'secret_access_key': 'test_secret',
                     'region': 'us-east-1',
-                    'bucket': 'test-bucket'
-                }
+                    'bucket': 'test-bucket',
+                },
             }
         }
         mock_app.logger = Mock()
@@ -81,11 +77,7 @@ class TestStorageProviderSelection:
         # Mock application
         mock_app = Mock()
         mock_app.instance_config = Mock()
-        mock_app.instance_config.data = {
-            'storage': {
-                'use': 'invalid_type'
-            }
-        }
+        mock_app.instance_config.data = {'storage': {'use': 'invalid_type'}}
         mock_app.logger = Mock()
 
         storage_mgr = StorageMgr(mock_app)