chore: bump version to 0.3.1 after successful release

Release completed successfully:
- GitHub Release: https://github.com/MakerCorn/raft-toolkit/releases/tag/v0.3.1
- CLI Docker: ghcr.io/makercorn/raft-toolkit:cli-v0.3.1
- Web Docker: ghcr.io/makercorn/raft-toolkit:web-v0.3.1

Generated with Claude Code

Co-Authored-By: Claude <[email protected]>

Author: actions-user

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.1] - 2025-07-03
+
 ## [0.3.0] - 2025-06-21
 
 ## [0.2.15] - 2025-06-21

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "raft-toolkit"
-version = "0.3.0"
+version = "0.3.1"
 description = "RAFT (Retrieval Augmented Fine Tuning) toolkit for generating synthetic Q&A datasets"
 readme = "README.md"
 license = "MIT"