fix: Fix prompt

anki_generator/clients/llm.py

@@ -16,7 +16,8 @@ class AnthropicClient:
         """Get card information from Anthropic API"""
         prompt = f"""
         Create an Anki card for the German word "{word}" (source: {source}).
-        Return the response in the following JSON format:
+        IMPORTANT: Respond with ONLY the JSON object, no other text.
+        Format:
         {{
             "german_word": "",
             "part_of_speech": "",
@@ -36,7 +37,7 @@ class AnthropicClient:
             model=self.model,
             max_tokens=self.max_tokens,
             temperature=self.temperature,
-            system="You are a helpful German language teaching assistant. Always respond with valid JSON.",
+            system="You are a helpful German language teaching assistant. Return ONLY valid JSON without any additional text or explanations.",
             messages=[
                 {
                     "role": "user",