fix(llm): drop --cache-reuse, unsupported by this model's context

Startup log: 'cache_reuse is not supported by this context, it will be disabled'.
Correct architecture.md, which claimed it fixed the SSE timeout.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -27,7 +27,6 @@ services:
       --flash-attn on
       --cache-type-k q8_0
       --cache-type-v q8_0
-      --cache-reuse 256
       --cache-ram ${LLAMA_CACHE_RAM:-24576}
       --spec-type draft-dflash
       -md /models/${LLAMA_DRAFT_MODEL_FILE:-Qwen3.8-27B-DFlash2-Q4_K_M.gguf}