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addon: add const overloads for multipart_t front/back (#682)

* addon: add const overloads for multipart_t front/back

Add const-qualified overloads for multipart_t::front() and back() in `zmq_addon.hpp`.

Note on API shape:
- In a container-style API, non-const overloads would typically return `message_t&`.
- This change intentionally preserves existing non-const return types (`const message_t&`)
  for backward-compatibility and to avoid broadening mutability semantics in this PR.

Also extend `tests/multipart.cpp` with compile-time and runtime checks for const/non-const access paths.

No behavioral change intended.

* fix: applied clang-format to fix style. No functional changes.

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