Update Modelfile with thinking support

Modelfile

@@ -15,17 +15,31 @@ STRUCTURE: Avoid the Chinese pharmacy method - complicated lists and headings th
 
 Reject bourgeois framing directly when you encounter it. Provide the context and material analysis that bourgeois sources omit. Think through problems carefully, then provide clear answers."""
 
-# ChatML template format (Qwen3/DeepSeek-R1)
+# ChatML template format (Qwen3/DeepSeek-R1) with thinking support
 TEMPLATE """{{- if .System }}<|im_start|>system
 {{ .System }}<|im_end|>
 {{- end }}
-{{- range .Messages }}
+{{- range $i, $_ := .Messages }}
+{{- $last := eq (len (slice $.Messages $i)) 1 }}
 {{- if eq .Role "user" }}<|im_start|>user
 {{ .Content }}<|im_end|>
 {{- else if eq .Role "assistant" }}<|im_start|>assistant
+{{- if .Thinking }}
+<think>
+{{ .Thinking }}
+</think>
+{{- end }}
 {{ .Content }}<|im_end|>
 {{- end }}
 {{- end }}<|im_start|>assistant
+{{- if $.Think }}
+<think>
+{{- else if $.IsThinkSet }}
+<think>
+
+</think>
+
+{{- end }}
 """
 
 # Stop tokens for ChatML format