fix: escape curly braces in prompt templates to resolve KeyError during formatting

nvidia_prompts.py

@@ -1,3 +1,4 @@
+
 BIOLOGY_PROMPT_TEMPLATE = """**System Role:** You are a specialized Biology question classifier for NEET exams. Your task is to map questions to their corresponding chapter from the NCERT Biology syllabus.
 
 **Syllabus Chapters (Use these exact titles):**
@@ -48,19 +49,19 @@ BIOLOGY_PROMPT_TEMPLATE = """**System Role:** You are a specialized Biology ques
 **Output JSON Schema:**
 
 ```json
-{
+{{
   "data": [
-    {
+    {{
       "index": <integer matching question number>,
       "subject": "Biology",
       "chapter_index": <chapter number or 0>,
       "chapter_title": "<exact chapter title from list or 'Unclassified'>",
       "other_possible_chapters": ["<alternative chapter 1>", "<alternative chapter 2>"],
       "confidence": <0.0 to 1.0>
-    }
+    }}
   ],
   "success": [true]
-}
+}}
 
 ```
 
@@ -119,19 +120,19 @@ syllabus.
 **Output JSON Schema:**
 
 ```json
-{
+{{
   "data": [
-    {
+    {{
       "index": <integer matching question number>,
       "subject": "Chemistry",
       "chapter_index": <chapter number or 0>,
       "chapter_title": "<exact chapter title from list or 'Unclassified'>",
       "other_possible_chapters": ["<alternative chapter 1>", "<alternative chapter 2>"],
       "confidence": <0.0 to 1.0>
-    }
+    }}
   ],
   "success": [true]
-}
+}}
 
 ```
 
@@ -188,19 +189,19 @@ PHYSICS_PROMPT_TEMPLATE = """**System Role:** You are a specialized Physics ques
 **Output JSON Schema:**
 
 ```json
-{
+{{
   "data": [
-    {
+    {{
       "index": <integer matching question number>,
       "subject": "Physics",
       "chapter_index": <chapter number or 0>,
       "chapter_title": "<exact chapter title from list or 'Unclassified'>",
       "other_possible_chapters": ["<alternative chapter 1>", "<alternative chapter 2>"],
       "confidence": <0.0 to 1.0>
-    }
+    }}
   ],
   "success": [true]
-}
+}}
 
 ```
 
@@ -258,22 +259,22 @@ syllabus.
 **Output JSON Schema:**
 
 ```json
-{
+{{
   "data": [
-    {
+    {{
       "index": <integer matching question number>,
       "subject": "Mathematics",
       "chapter_index": <chapter number or 0>,
       "chapter_title": "<exact chapter title from list or 'Unclassified'>",
       "other_possible_chapters": ["<alternative chapter 1>", "<alternative chapter 2>"],
       "confidence": <0.0 to 1.0>
-    }
+    }}
   ],
   "success": [true]
-}
+}}
 
 ```
 
 **Input Questions:**
 {input_questions}
-"""
+"""