Fix memory leak in LibraryPatcher::initialize()

[Copilot]

Addresses feedback from #334: realpath(info.dli_fname, nullptr) allocates heap memory that was never freed.

Changes

• Replace dynamic allocation with static buffer _profiler_path[PATH_MAX], matching the pattern in patch_library_unlocked()
• Add null check with fallback to info.dli_fname when realpath() fails (e.g., virtual files, permission errors)

// Before
_profiler_name = realpath(info.dli_fname, nullptr);  // malloc'd, never freed

// After
static char _profiler_path[PATH_MAX];
_profiler_name = realpath(info.dli_fname, _profiler_path);
if (_profiler_name == nullptr) {
  _profiler_name = info.dli_fname;  // fallback on error
}

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[zhengyu123]

No, this is not a leak, _profiler_name is immortal.

[zhengyu123]

Not a leak.