Enhance installation and migration processes

- Added a post-installation setup script for initialization.
  - Updated README with installation notes for Playwright setup.
  - Enhanced migration logging for better error visibility.
  - Added 'pydantic' to requirements.
  - Bumped version to 0.3.746.

requirements.txt

@@ -1,5 +1,4 @@
 aiosqlite~=0.20
-html2text~=2024.2
 lxml~=5.3
 litellm>=1.53.1
 numpy>=1.26.0,<3
@@ -13,4 +12,5 @@ xxhash~=3.4
 rank-bm25~=0.2
 aiofiles>=24.1.0
 colorama~=0.4
-snowballstemmer~=2.2
+snowballstemmer~=2.2
+pydantic>=2.10