Use full system prompts with Gradio dependencies

Now that Gradio dependencies are installed in requirements.txt,
we can directly import and use the full expert-level prompts from
anycoder_app without fallbacks.

Changes:
- Remove all try/except fallback logic
- Directly import prompts from anycoder_app.prompts
- Initialize Gradio and ComfyUI prompts with update_gradio_system_prompts()
- Load full API documentation into prompts at startup
- Clean, simple imports with detailed startup logging

The backend now uses the complete, expert-level system prompts:
✅ HTML_SYSTEM_PROMPT - Full HTML/CSS/JS guidelines
✅ GRADIO_SYSTEM_PROMPT - Complete Gradio API docs from gradio.app/llms.txt
✅ STREAMLIT_SYSTEM_PROMPT - Streamlit with Docker requirements
✅ REACT_SYSTEM_PROMPT - Next.js with Tailwind guidelines
✅ TRANSFORMERS_JS_SYSTEM_PROMPT - Transformers.js patterns
✅ JSON_SYSTEM_PROMPT - ComfyUI API docs from docs.comfy.org/llms.txt
✅ All prompts include 'Built with anycoder' attribution rules

backend_api.py

@@ -19,47 +19,25 @@ import os
 from huggingface_hub import InferenceClient
 import httpx
 
-# Import system prompts for code generation - use fallback if imports fail
-try:
-    from anycoder_app.prompts import (
-        HTML_SYSTEM_PROMPT,
-        TRANSFORMERS_JS_SYSTEM_PROMPT,
-        STREAMLIT_SYSTEM_PROMPT,
-        REACT_SYSTEM_PROMPT,
-        GENERIC_SYSTEM_PROMPT
-    )
-    # Try to import and initialize dynamic prompts (Gradio, ComfyUI)
-    try:
-        from anycoder_app.docs_manager import update_gradio_system_prompts, update_json_system_prompts
-        from anycoder_app.prompts import GRADIO_SYSTEM_PROMPT, JSON_SYSTEM_PROMPT
-        print("[Startup] Initializing Gradio and ComfyUI system prompts...")
-        update_gradio_system_prompts()
-        update_json_system_prompts()
-        # Re-import to get updated prompts
-        from anycoder_app.prompts import GRADIO_SYSTEM_PROMPT as GRADIO_PROMPT_UPDATED
-        from anycoder_app.prompts import JSON_SYSTEM_PROMPT as JSON_PROMPT_UPDATED
-        GRADIO_SYSTEM_PROMPT = GRADIO_PROMPT_UPDATED
-        JSON_SYSTEM_PROMPT = JSON_PROMPT_UPDATED
-        print("[Startup] System prompts initialized successfully")
-    except Exception as e:
-        print(f"[Startup] Warning: Could not initialize dynamic prompts: {e}")
-        # Use fallback prompts
-        GRADIO_SYSTEM_PROMPT = "You are an expert Gradio developer. Create complete, working Gradio applications."
-        JSON_SYSTEM_PROMPT = "You are an expert at generating JSON configurations. Create valid, well-structured JSON."
-    
-    print("[Startup] System prompts loaded successfully")
-    
-except Exception as e:
-    print(f"[Startup] ERROR: Could not import prompts from anycoder_app: {e}")
-    print("[Startup] Using basic fallback prompts")
-    # Define minimal fallback prompts
-    HTML_SYSTEM_PROMPT = "You are an expert web developer. Create complete HTML applications with CSS and JavaScript."
-    TRANSFORMERS_JS_SYSTEM_PROMPT = "You are an expert at creating transformers.js applications. Generate complete working code."
-    STREAMLIT_SYSTEM_PROMPT = "You are an expert Streamlit developer. Create complete Streamlit applications."
-    REACT_SYSTEM_PROMPT = "You are an expert React developer. Create complete React applications with Next.js."
-    GRADIO_SYSTEM_PROMPT = "You are an expert Gradio developer. Create complete, working Gradio applications."
-    JSON_SYSTEM_PROMPT = "You are an expert at generating JSON configurations. Create valid, well-structured JSON."
-    GENERIC_SYSTEM_PROMPT = "You are an expert {language} developer. Create complete, working {language} applications."
+# Import system prompts for code generation
+# These come from anycoder_app which has all the detailed prompts
+from anycoder_app.prompts import (
+    HTML_SYSTEM_PROMPT,
+    TRANSFORMERS_JS_SYSTEM_PROMPT,
+    STREAMLIT_SYSTEM_PROMPT,
+    REACT_SYSTEM_PROMPT,
+    GENERIC_SYSTEM_PROMPT
+)
+
+# Initialize dynamic Gradio and ComfyUI system prompts with full API docs
+from anycoder_app.docs_manager import update_gradio_system_prompts, update_json_system_prompts
+print("[Startup] Initializing Gradio and ComfyUI system prompts with API documentation...")
+update_gradio_system_prompts()
+update_json_system_prompts()
+
+# Import the now-populated prompts
+from anycoder_app.prompts import GRADIO_SYSTEM_PROMPT, JSON_SYSTEM_PROMPT
+print("[Startup] ✅ All system prompts loaded successfully with full API documentation")
 
 # Define models and languages here to avoid importing Gradio UI
 AVAILABLE_MODELS = [