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>

tests/conftest.py

@@ -0,0 +1,19 @@
+"""Pytest configuration and fixtures."""
+
+import pytest
+from app import app as flask_app
+from routes import register_blueprints
+
+
+@pytest.fixture
+def app():
+    """Create application for testing."""
+    register_blueprints(flask_app)
+    flask_app.config['TESTING'] = True
+    return flask_app
+
+
+@pytest.fixture
+def client(app):
+    """Create test client."""
+    return app.test_client()