Add webpage screenshot capture with Playwright

Implements automated screenshot capture for all discovered HTTP/HTTPS services using Playwright with headless Chromium. Screenshots are saved as PNG files and referenced in JSON reports.

Features:
- Separate ScreenshotCapture module for code organization
- Viewport screenshots (1280x720) with 15-second timeout
- Graceful handling of self-signed certificates
- Browser reuse for optimal performance
- Screenshots stored in timestamped directories
- Comprehensive documentation in README.md and new CLAUDE.md

Technical changes:
- Added src/screenshot_capture.py: Screenshot capture module with context manager pattern
- Updated src/scanner.py: Integrated screenshot capture into HTTP/HTTPS analysis phase
- Updated Dockerfile: Added Chromium and Playwright browser installation
- Updated requirements.txt: Added playwright==1.40.0
- Added CLAUDE.md: Developer documentation and implementation guide
- Updated README.md: Enhanced features section, added screenshot details and troubleshooting
- Updated .gitignore: Ignore entire output/ directory including screenshots

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

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

src/scanner.py

@@ -5,6 +5,7 @@ SneakyScanner - Masscan-based network scanner with YAML configuration
 
 import argparse
 import json
+import logging
 import subprocess
 import sys
 import tempfile
@@ -18,6 +19,8 @@ import yaml
 from libnmap.process import NmapProcess
 from libnmap.parser import NmapParser
 
+from screenshot_capture import ScreenshotCapture
+
 # Force unbuffered output for Docker
 sys.stdout.reconfigure(line_buffering=True)
 sys.stderr.reconfigure(line_buffering=True)
@@ -31,6 +34,7 @@ class SneakyScanner:
         self.output_dir = Path(output_dir)
         self.output_dir.mkdir(parents=True, exist_ok=True)
         self.config = self._load_config()
+        self.screenshot_capture = None
 
     def _load_config(self) -> Dict[str, Any]:
         """Load and validate YAML configuration"""
@@ -511,6 +515,16 @@ class SneakyScanner:
 
                 result = {'protocol': protocol}
 
+                # Capture screenshot if screenshot capture is enabled
+                if self.screenshot_capture:
+                    try:
+                        screenshot_path = self.screenshot_capture.capture(ip, port, protocol)
+                        if screenshot_path:
+                            result['screenshot'] = screenshot_path
+                    except Exception as e:
+                        print(f"  Screenshot capture error for {ip}:{port}: {e}",
+                              file=sys.stderr, flush=True)
+
                 # If HTTPS, analyze SSL/TLS
                 if protocol == 'https':
                     try:
@@ -545,6 +559,14 @@ class SneakyScanner:
 
         # Record start time
         start_time = time.time()
+        scan_timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
+
+        # Initialize screenshot capture
+        self.screenshot_capture = ScreenshotCapture(
+            output_dir=str(self.output_dir),
+            scan_timestamp=scan_timestamp,
+            timeout=15
+        )
 
         # Collect all unique IPs
         all_ips = set()
@@ -658,6 +680,10 @@ class SneakyScanner:
 
             report['sites'].append(site_result)
 
+        # Clean up screenshot capture browser
+        if self.screenshot_capture:
+            self.screenshot_capture._close_browser()
+
         return report
 
     def save_report(self, report: Dict[str, Any]) -> Path:
@@ -673,6 +699,13 @@ class SneakyScanner:
 
 
 def main():
+    # Configure logging
+    logging.basicConfig(
+        level=logging.INFO,
+        format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
+        handlers=[logging.StreamHandler(sys.stderr)]
+    )
+
     parser = argparse.ArgumentParser(
         description='SneakyScanner - Masscan-based network scanner'
     )