fix: revert app.py to working version (remove broken diagnostic code)

app.py

@@ -67,48 +67,6 @@ def forecast_api(run_date_str, forecast_type):
         return error_path
 
 
-
-
-def run_diagnostic():
-    """Run comprehensive diagnostic tests. Returns path to report file."""
-    import subprocess
-    import sys
-    
-    output_path = "/tmp/diagnostic_report.txt"
-    
-    try:
-        result = subprocess.run(
-            [sys.executable, "diagnostic.py"],
-            capture_output=True,
-            text=True,
-            timeout=600
-        )
-        
-        with open(output_path, 'w') as f:
-            f.write("=== DIAGNOSTIC REPORT ===
-
-")
-            f.write("STDOUT:
-" + result.stdout)
-            f.write("
-
-STDERR:
-" + result.stderr)
-            f.write(f"
-
-Return code: {result.returncode}
-")
-        
-        print(f"Diagnostic completed: {output_path}")
-    except Exception as e:
-        with open(output_path, 'w') as f:
-            f.write(f"Diagnostic ERROR: {str(e)}
-")
-            import traceback
-            f.write(traceback.format_exc())
-    
-    return output_path
-
 # Build Gradio interface
 with gr.Blocks(title="FBMC Chronos-2 Forecasting") as demo:
     gr.Markdown("""
@@ -160,15 +118,6 @@ with gr.Blocks(title="FBMC Chronos-2 Forecasting") as demo:
             - Precision: bfloat16
             """)
 
-
-    gr.Markdown("---")
-    gr.Markdown("### Diagnostics")
-    with gr.Row():
-        diagnostic_btn = gr.Button("Run Diagnostics", variant="secondary")
-        diagnostic_output = gr.File(label="Diagnostic Report", type="filepath")
-    
-    diagnostic_btn.click(fn=run_diagnostic, inputs=[], outputs=diagnostic_output)
-    
     # Wire up the interface
     submit_btn.click(
         fn=forecast_api,