Add CI/CD pipeline, logging enhancements, and release management

- Create a GitHub Actions workflow for testing with Python 3.12 and 3.13.
- Update Makefile to include release management commands and pipeline checks.
- Document the CI/CD pipeline structure and usage in PIPELINE.md.
- Add structlog for structured logging and enhance logging utilities.
- Implement release management script for automated versioning and tagging.
- Modify logging configuration to support structured logging and improved formatting.
- Update dependencies in pyproject.toml and poetry.lock to include structlog.
- Enhance access logging in server and middleware to include structured data.

pyproject.toml

@@ -13,6 +13,7 @@ dependencies = [
     "uvicorn[standard] (>=0.35.0,<0.36.0)",
     "pyyaml (>=6.0,<7.0)",
     "types-pyyaml (>=6.0.12.20250822,<7.0.0.0)",
+    "structlog (>=25.4.0,<26.0.0)",
 ]
 
 [project.scripts]
@@ -34,7 +35,7 @@ requires = ["poetry-core>=2.0.0,<3.0.0"]
 build-backend = "poetry.core.masonry.api"
 
 [tool.black]
-line-length = 120
+line-length = 150
 target-version = ['py312']
 include = '\.pyi?$'
 exclude = '''