refactor: Convert to UV Python project with proper package structure

- Restructured project to use src/stocktool package layout
- Migrated to UV for dependency management
- Added pyproject.toml with all dependencies (sv-ttk, pillow, requests, pyyaml)
- Organized test files into tests/ directory
- Updated .gitignore for UV projects
- Comprehensive README with installation and usage instructions
- Removed old unused files (main.py, stock_tool_gui.py, duplicate copy)
- Added CLI entry point: stock-tool command

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.gitignore

@@ -4,29 +4,20 @@ __pycache__/
 *$py.class
 *.so
 .Python
-build/
-develop-eggs/
-dist/
-downloads/
-eggs/
-.eggs/
-lib/
-lib64/
-parts/
-sdist/
-var/
-wheels/
 *.egg-info/
-.installed.cfg
+dist/
+build/
 *.egg
-MANIFEST
 
 # Virtual Environment
+.venv/
 venv/
-env/
 ENV/
-env.bak/
-venv.bak/
+env/
+
+# UV
+.uv/
+uv.lock
 
 # IDE
 .vscode/
@@ -34,20 +25,14 @@ venv.bak/
 *.swp
 *.swo
 *~
-.DS_Store
 
-# Configuration files (may contain sensitive data)
+# OS
+.DS_Store
+Thumbs.db
+
+# Config
 *.yaml
-*.yml
 !example_config.yaml
 
 # Logs
 *.log
-
-# Test files (optional - uncomment if you don't want to track tests)
-# test_*.py
-
-# Temporary files
-*.tmp
-*.bak
-*.cache