Reorganize codebase: separate server architecture from business logic

- Created feed_parser.py module with YouTubeFeedParser and FeedEntry classes
- Refactored main.py to focus on Flask routing with two endpoints:
  - GET / for homepage
  - GET /api/feed for REST API with query parameters
- Updated CLAUDE.md with new architecture documentation
- Implemented clean separation between core logic and web server layers

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

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

main.py

@@ -0,0 +1,60 @@
+"""Flask web application for YouTube RSS feed parsing."""
+
+from flask import Flask, render_template, request, jsonify
+from feed_parser import YouTubeFeedParser
+
+
+app = Flask(__name__)
+
+# Default channel ID for demonstration
+DEFAULT_CHANNEL_ID = "UCtTWOND3uyl4tVc_FarDmpw"
+
+
+@app.route("/", methods=["GET"])
+def index():
+    """Render the main page."""
+    return render_template("index.html")
+
+
+@app.route("/api/feed", methods=["GET"])
+def get_feed():
+    """API endpoint to fetch YouTube channel feed.
+
+    Query parameters:
+        channel_id: YouTube channel ID (optional, uses default if not provided)
+        filter_shorts: Whether to filter out Shorts (default: true)
+
+    Returns:
+        JSON response with feed data or error message
+    """
+    channel_id = request.args.get("channel_id", DEFAULT_CHANNEL_ID)
+    filter_shorts = request.args.get("filter_shorts", "true").lower() == "true"
+
+    parser = YouTubeFeedParser(channel_id)
+    result = parser.fetch_feed(filter_shorts=filter_shorts)
+
+    if result is None:
+        return jsonify({"error": "Failed to fetch feed"}), 500
+
+    return jsonify(result)
+
+
+def main():
+    """CLI entry point for testing feed parser."""
+    parser = YouTubeFeedParser(DEFAULT_CHANNEL_ID)
+    result = parser.fetch_feed()
+
+    if result is None:
+        print("Failed to retrieve RSS feed")
+        return
+
+    print(f"Feed Title: {result['feed_title']}")
+    print(f"Feed Link: {result['feed_link']}")
+
+    for entry in result['entries']:
+        print(f"\nEntry Title: {entry['title']}")
+        print(f"Entry Link: {entry['link']}")
+
+
+if __name__ == "__main__":
+    main()