Refactor into modular structure with improvements

- Split monolithic intercept.py (15k lines) into modular structure:
  - routes/ - Flask blueprints for each feature
  - templates/ - Jinja2 HTML templates
  - data/ - OUI database, satellite TLEs, detection patterns
  - utils/ - dependencies, process management, logging
  - config.py - centralized configuration with env var support

- Add type hints to function signatures
- Replace bare except clauses with specific exceptions
- Add proper logging module (replaces print statements)
- Add environment variable support (INTERCEPT_* prefix)
- Add test suite with pytest
- Add Dockerfile for containerized deployment
- Add pyproject.toml with ruff/black/mypy config
- Add requirements-dev.txt for development dependencies

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

requirements-dev.txt

@@ -0,0 +1,14 @@
+# Development dependencies
+-r requirements.txt
+
+# Testing
+pytest>=7.0.0
+pytest-cov>=4.0.0
+
+# Code quality
+ruff>=0.1.0
+black>=23.0.0
+mypy>=1.0.0
+
+# Type stubs
+types-flask>=1.1.0