Fix ID mismatch crash when arXiv submission year differs from publication year

[Copilot]

arxiv_to_publications_correct.py hard-asserted that the cite key generated from DOI metadata matched the original bib entry ID. This breaks whenever a paper's publication year differs from its arXiv submission year (e.g., BonteEtAl2024 published in 2026 → DOI metadata yields BonteEtAl2026 → AssertionError → exit code 1).

Changes

• Removed hard assertion assert id == id_db — replaced with an informational print when the IDs differ
• Use id_db throughout for all database operations (lookup, removal, and bib key assignment), preserving the original cite key for backward compatibility

# Before
assert id == id_db, f"ID generated with new DOI ({id}) is different than the original in database ({id_db})"
entries = db.get_entry_dict()
assert entries[id]["ENTRYTYPE"] == 'unpublished', ...
db.entries.remove(entries[id])
bib = "{".join([bType] + [','.join([id]+rest2)] + rest1[1:])

# After
if id != id_db:
    print(f'Note: ID generated with new DOI ({id}) differs from the original in database ({id_db}). Keeping original ID.')
entries = db.get_entry_dict()
assert entries[id_db]["ENTRYTYPE"] == 'unpublished', ...
db.entries.remove(entries[id_db])
bib = "{".join([bType] + [','.join([id_db]+rest2)] + rest1[1:])

Affected entries in the triggering run: BonteEtAl2024, MardalEtAl2024, DurastanteEtAl2025, HahnEtAl2025 — all submitted to arXiv in 2024/2025 but published in 2026.

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