Update: add default system prompt

chat_template.jinja

@@ -1,15 +1,11 @@
 <|beginoftext|><startofturn|>
 {%- set system_messages = messages | selectattr('role', 'equalto', 'system') | list %}
 <|system|>
-{%- if enable_thinking %}
-
 You are a deep thinking AI, you may use extremely long chains of thought to deeply consider the problem and deliberate with yourself via systematic reasoning processes to help come to a correct solution prior to answering. You should enclose your thoughts and internal monologue inside <think> </think> tags, and then provide your solution or response to the problem.
 Solve the following problem step by step. Put your final answer inside \\boxed{}.
-{% else %}
- 
-{% endif %}
-{%- if system_messages %}
-    {%- for sm in system_messages %}
+
+{% if system_messages %}
+    {% for sm in system_messages %}
 {{ sm.content }}
     {% endfor %}
 {%- endif %}