Refactor code style, comments, and robot implementations

Move UML PDF to doc/ and update .gitignore. Normalize includes,
whitespace and function signatures across headers/sources and add
concise class/function documentation. Fix RandomBot so the mine
limit is computed once and simplify DigDeepBot/SortBot mining logic.
Tidy World/Game initialization, error handling, and minor const/var
clarifications for readability and correctness

main.cpp

@@ -1,14 +1,13 @@
-#include <iostream>
 #include "include/Game.h"
+#include <iostream>
 
 int main () {
     try {
         Game game;
-        game.run ();
-    } catch ( const std::exception& e ) {
+        game.run();
+    } catch ( const std::exception &e ) {
         std::cerr << "Fatal Error: " << e.what() << "\n";
         return 1;
     }
     return 0;
-
 }