preliminary_mul_200k: replace with v200064 (vocab 200064, 128-aligned; IDs 0-199999 identical to prior 200000 build) + same special tokens + post-processor
Fix eos_token to </s> (id 2) in preliminary_enh + preliminary_mul configs (was wrongly <|assistant_end|>); special_tokens_map regenerated to match base Apertus-70B-2509