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>

utils/__init__.py

@@ -0,0 +1,14 @@
+# Utility modules for INTERCEPT
+from .dependencies import check_tool, check_all_dependencies, TOOL_DEPENDENCIES
+from .process import cleanup_stale_processes, is_valid_mac, is_valid_channel, detect_devices
+from .logging import (
+    get_logger,
+    app_logger,
+    pager_logger,
+    sensor_logger,
+    wifi_logger,
+    bluetooth_logger,
+    adsb_logger,
+    satellite_logger,
+    iridium_logger,
+)