🐛 fix: support multiple EOS tokens for GLM-4

GLM-4 uses multiple EOS tokens [151329, 151336, 151338] where 151336
(<|user|>) should also stop generation. Previously only the first EOS
from tokenizer was used, causing generation to always hit max_tokens.

Changes:
- config.py: Change eos type to int | list[int]
- llm_engine.py: Read eos_token_id from hf_config (contains full list)
- scheduler.py: Use set for efficient multi-EOS lookup

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

nanovllm/config.py

@@ -22,7 +22,7 @@ class Config:
     tensor_parallel_size: int = 1
     enforce_eager: bool = False
     hf_config: AutoConfig | None = None
-    eos: int = -1
+    eos: int | list[int] = -1  # Single EOS token or list of EOS tokens (e.g., GLM-4)
     kvcache_block_size: int = 1024
     num_kvcache_blocks: int = -1
     dtype: str | None = None  # "float16", "bfloat16", or None (use model default)