fix(critical): 3 bugs causing 0.0 score — OOM crash + thinking param + multimodal

Bug 1 (FATAL): computility-run.yaml max-model-len 256000 → 131072,
gpu-memory-utilization 0.95 → 0.90, max-num-batched-tokens 4096 → 8192.
Server OOM'd on t2_n_2, killed all subsequent modules (replay=0, opencompass=0).

Bug 2 (functional): protocol.py thinking={enable:true/false} was accepted
but NEVER mapped to chat_template_kwargs.enable_thinking. Qwen3 template
never received the parameter → t1a, t1c, d07, d10 all FAIL.

Bug 3 (functional): chat_utils.py _placeholder_str didn't handle qwen3_5
model_type for multimodal → d05_multimodal HTTP 400 TypeError.

Expected: functional pass rate 0.41 → 0.90+, server stays alive for all
4 modules, total score 0.0 → 60000+ (matching reference sub 168).

computility-run.yaml

@@ -8,9 +8,9 @@ command:
     - --served-model-name
     - llm
     - --max-model-len
-    - '256000'
+    - '131072'
     - --gpu-memory-utilization
-    - '0.95'
+    - '0.90'
     - --trust-remote-code
     - -tp
     - '4'
@@ -19,7 +19,7 @@ command:
     - --disable-log-requests
     - --disable-frontend-multiprocessing
     - --max-num-batched-tokens
-    - '4096'
+    - '8192'
     - --enable-chunked-prefill
     - --max-seq-len-to-capture
     - '32768'