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>

Dockerfile

@@ -0,0 +1,40 @@
+# INTERCEPT - Signal Intelligence Platform
+# Docker container for running the web interface
+
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies for RTL-SDR tools
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    # RTL-SDR tools
+    rtl-sdr \
+    # 433MHz decoder
+    rtl-433 \
+    # Pager decoder
+    multimon-ng \
+    # WiFi tools (aircrack-ng suite)
+    aircrack-ng \
+    # Bluetooth tools
+    bluez \
+    # Cleanup
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Expose web interface port
+EXPOSE 5050
+
+# Environment variables with defaults
+ENV INTERCEPT_HOST=0.0.0.0 \
+    INTERCEPT_PORT=5050 \
+    INTERCEPT_LOG_LEVEL=INFO
+
+# Run the application
+CMD ["python", "intercept.py"]