feat: implement WebADIS authentication and add medianumber retrieval functionality

src/backend/database.py

@@ -280,6 +280,21 @@ class Database:
         conn.commit()
         self.close_connection(conn)
 
+    def getWebADISAuth(self) -> Tuple[str, str]:
+        """
+        Get the WebADIS authentication data from the database
+
+        Returns:
+            Tuple[str, str]: The username and password for WebADIS
+        """
+        result = self.query_db(
+            "SELECT username, password FROM webadis_login WHERE effective_range='SAP'",
+            one=True,
+        )
+        if result is None:
+            return ("", "")
+        return (result[0], result[1])
+
     @log.catch
     def query_db(
         self,