release: bump version to 0.8.0

Cloud-neutral API refactor:
- Rename all GCP-specific names to cloud-neutral equivalents
- Add AWS provider implementation
- All old names kept as deprecated aliases
- Env var migration support (CLOUD_* with GCS_* fallback)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Pigbibi

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "quant-platform-kit"
-version = "0.7.41"
+version = "0.8.0"
 description = "QuantStrategyLab shared runtime: broker adapters, domain models, execution ports, cloud provider abstraction, and notification utilities."
 readme = "README.md"
 requires-python = ">=3.10"