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fix(mm): copy_data page-offset fix + mmap/munmap POSIX compliance

Merged StellaOS requested to merge fix/mm into main
  1. copy_data: handle non-page-aligned segment vaddr (fixes ld.so DT_VERSYM assertion)
  2. mmap: correct MAP_FIXED/hint logic, add VA conflict check
  3. munmap: support partial unmap, reclaim mmap_base
  4. file-backed page fault: SIGBUS on out-of-range access
  5. SimpleRange: add set_start()/contains() helpers