Fix OPIK import errors for Hugging Face Spaces deployment

- Make OPIK imports optional with graceful error handling
- Update opik_utils.py to check OPIK availability before use
- Update app.py to handle missing OPIK dependencies
- Fix README.md app_file configuration
- Ensure app runs without OPIK dependencies on HF Spaces

app.py

@@ -15,7 +15,15 @@ sys.path.append('src')
 
 from second_brain_online.application.agents import get_agent
 from second_brain_online.application.ui import CustomGradioUI
-from second_brain_online import opik_utils
+
+# Try to import opik_utils, but handle import errors gracefully
+try:
+    from second_brain_online import opik_utils
+    OPIK_UTILS_AVAILABLE = True
+except ImportError as e:
+    print(f"⚠️  OPIK utils not available: {e}")
+    opik_utils = None
+    OPIK_UTILS_AVAILABLE = False
 
 def main():
     """Main function for Hugging Face Space deployment."""
@@ -33,11 +41,14 @@ def main():
     print(f"  MONGODB_URI: {'SET' if os.getenv('MONGODB_URI') else 'NOT SET'}")
     
     # Configure OPIK (optional - will use default project if COMET_PROJECT not set)
-    try:
-        opik_utils.configure()
-        print("✅ OPIK configured successfully")
-    except Exception as e:
-        print(f"⚠️  OPIK configuration failed: {e}")
+    if OPIK_UTILS_AVAILABLE:
+        try:
+            opik_utils.configure()
+            print("✅ OPIK configured successfully")
+        except Exception as e:
+            print(f"⚠️  OPIK configuration failed: {e}")
+    else:
+        print("⚠️  OPIK utils not available, skipping configuration")
     
     try:
         # Initialize agent

src/second_brain_online/opik_utils.py

@@ -5,13 +5,26 @@ OPIK utilities for Second Brain AI Assistant.
 
 import os
 from loguru import logger
-import opik
-from opik import OpikConfigurator
 
 from second_brain_online.config import settings
 
+# Try to import opik, but handle import errors gracefully
+try:
+    import opik
+    from opik import OpikConfigurator
+    OPIK_AVAILABLE = True
+except ImportError as e:
+    logger.warning(f"OPIK not available: {e}")
+    opik = None
+    OpikConfigurator = None
+    OPIK_AVAILABLE = False
+
 
 def configure() -> None:
+    if not OPIK_AVAILABLE:
+        logger.warning("OPIK is not available. Skipping OPIK configuration.")
+        return
+        
     if settings.COMET_API_KEY:
         try:
             client = OpikConfigurator(api_key=settings.COMET_API_KEY)
@@ -39,7 +52,11 @@ def configure() -> None:
         )
 
 
-def get_or_create_dataset(name: str, prompts: list[str]) -> opik.Dataset | None:
+def get_or_create_dataset(name: str, prompts: list[str]):
+    if not OPIK_AVAILABLE:
+        logger.warning("OPIK is not available. Cannot create dataset.")
+        return None
+        
     client = opik.Opik()
     try:
         dataset = client.get_dataset(name)