Refactor into integrated Python package structure

Architecture Changes:
- Created src/seo/ package with modular architecture
- Main application class (SEOApp) with Rails-inspired API
- Separated concerns into distinct modules:
  - app.py: Main application orchestrator
  - cli.py: Command-line interface
  - config.py: Configuration management
  - exporter.py: Post export functionality
  - analyzer.py: AI analysis
  - recategorizer.py: Recategorization
  - seo_checker.py: SEO quality checking
  - categories.py: Category management
  - approval.py: User approval system

New Features:
- Proper Python package structure (src layout)
- setup.py and setup.cfg for installation
- Can be installed with: pip install -e .
- Entry point: seo = seo.cli:main
- Cleaner imports and dependencies

Benefits:
- Better code organization
- Easier to maintain and extend
- Follows Python best practices
- Proper package isolation
- Can be imported as library
- Testable components
- Clear separation of concerns

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

setup.cfg

@@ -0,0 +1,37 @@
+[metadata]
+name = seo-automation
+version = 1.0.0
+description = WordPress SEO automation with AI-powered recommendations
+long_description = file: README.md
+long_description_content_type = text/markdown
+license = MIT
+author = SEO Automation Team
+url = https://github.com/example/seo-automation
+classifiers =
+    Development Status :: 4 - Beta
+    Intended Audience :: Developers
+    Topic :: Internet :: WWW/HTTP
+    License :: OSI Approved :: MIT License
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
+
+[options]
+package_dir =
+    = src
+packages = find:
+python_requires = >=3.8
+install_requires =
+    requests>=2.31.0
+    python-dotenv>=1.0.0
+    PyYAML>=6.0
+
+[options.packages.find]
+where = src
+
+[options.entry_points]
+console_scripts =
+    seo = seo.cli:main