Add updated app.py with proper error handling for imports

app.py

@@ -0,0 +1,28 @@
+import sys
+import os
+
+# Add the current directory to the Python path
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+# Import fastapi for fallback
+import fastapi
+
+# Try to import the main app
+try:
+    from app.main import app
+    print("Successfully imported app from app.main")
+except ImportError as e:
+    print(f"Error importing app: {e}")
+    # Create a fallback app
+    app = fastapi.FastAPI(title="Collinear API Fallback")
+    
+    @app.get("/")
+    async def root():
+        return {
+            "message": "Fallback API is running",
+            "error": "Could not import main application. See logs for details."
+        }
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run("app:app", host="0.0.0.0", port=7860, reload=True)