feat: Add patchset history and diff support with cvsps integration

- Add cvsps package to Docker dependencies
- Implement patchset retrieval and diff endpoints in API
- Add _run_cvsps_command() helper for cvsps integration
- Enhance file history parsing with log message extraction
- Improve UI with enhanced styling and patchset functionality

cvs_proxy/app.py

@@ -108,6 +108,40 @@ def get_file_history():
     except Exception as e:
         return jsonify({"error": str(e)}), 500
 
+@api_bp.route('/api/v1/patchsets', methods=['GET'])
+def get_patchsets():
+    """
+    Get repository patchset history using cvsps
+    """
+    if not cvs_client:
+        return jsonify({"error": "CVS Client not initialized"}), 500
+    
+    try:
+        patchsets = cvs_client.get_patchsets()
+        return jsonify(patchsets)
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+@api_bp.route('/api/v1/patchset-diff', methods=['GET'])
+def get_patchset_diff():
+    """
+    Get diff for a specific patchset
+    Required query param: patchset (patchset number)
+    """
+    if not cvs_client:
+        return jsonify({"error": "CVS Client not initialized"}), 500
+    
+    patchset = request.args.get('patchset')
+    
+    if not patchset:
+        return jsonify({"error": "Missing patchset parameter"}), 400
+    
+    try:
+        diff = cvs_client.get_patchset_diff(patchset)
+        return jsonify({"diff": diff})
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
 @api_bp.route('/api/v1/file', methods=['GET'])
 def get_file_content():
     """