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.

poetry.lock

@@ -653,6 +653,18 @@ typing-extensions = {version = ">=4.10.0", markers = "python_version < \"3.13\""
 [package.extras]
 full = ["httpx (>=0.27.0,<0.29.0)", "itsdangerous", "jinja2", "python-multipart (>=0.0.18)", "pyyaml"]
 
+[[package]]
+name = "structlog"
+version = "25.4.0"
+description = "Structured Logging for Python"
+optional = false
+python-versions = ">=3.8"
+groups = ["main"]
+files = [
+    {file = "structlog-25.4.0-py3-none-any.whl", hash = "sha256:fe809ff5c27e557d14e613f45ca441aabda051d119ee5a0102aaba6ce40eed2c"},
+    {file = "structlog-25.4.0.tar.gz", hash = "sha256:186cd1b0a8ae762e29417095664adf1d6a31702160a46dacb7796ea82f7409e4"},
+]
+
 [[package]]
 name = "types-pyyaml"
 version = "6.0.12.20250822"
@@ -960,4 +972,4 @@ dev = ["black", "flake8", "isort", "mypy", "pytest", "pytest-cov"]
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.12"
-content-hash = "e145aef2574fcda0c0d45b8620988baf25f386a1b6ccf199c56210cbc0e3aa76"
+content-hash = "5eda39db8e3d119d03c8e6083d1f9cd14691669a7130fb17b1445a0dd7bb79e7"