fix: compilation error due to missing cstdlib header in cli_args.cpp

## Problem The `src/realm/util/cli_args.cpp` file uses `std::strtol` function on line 67 but doesn't include the `<cstdlib>` header where this function is defined. This causes compilation errors in some environments. ## Current Code ```cpp #include <algorithm> #include <cerrno> #include <cstdint> #include <string> // Missing: #include <cstdlib> // Line 67 uses std::strtol without proper header int64_t val = std::strtol(m_value.data(), nullptr, 10); ``` ## Expected Solution Add the missing header: ```cpp #include <algorithm> #include <cstdlib> // Add this line #include <cerrno> #include <cstdint> #include <string> ``` ## Impact - **Build compatibility**: Fixes compilation issues across different platforms - **No breaking changes**: Simple header addition - **Low risk**: Minimal change with clear benefit ## Labels - `bug` - `build` - `good first issue`