fix: Update Gradio UI dropdown with all supported hardware options

Updated the cost estimation tab's hardware dropdown to include all
supported hardware options (was causing 'not in list' errors):

**Modal hardware:**
- cpu, gpu_t4, gpu_l4, gpu_a10, gpu_l40s, gpu_a100, gpu_a100_80gb,
gpu_h100, gpu_h200, gpu_b200

**HuggingFace Jobs hardware:**
- cpu-basic, cpu-upgrade
- t4-small, t4-medium
- l4x1, l4x4
- a10g-small, a10g-large, a10g-largex2, a10g-largex4
- a100-large
- v5e-1x1, v5e-2x2, v5e-2x4

This matches the hardware options supported by the estimate_cost tool in mcp_tools.py.

app.py

@@ -281,9 +281,21 @@ def create_gradio_ui():
                         )
                         cost_hardware = gr.Dropdown(
                             label="Hardware Type",
-                            choices=["auto", "cpu", "gpu_a10", "gpu_h200"],
+                            choices=[
+                                "auto",
+                                # Modal
+                                "cpu", "gpu_t4", "gpu_l4", "gpu_a10", "gpu_l40s",
+                                "gpu_a100", "gpu_a100_80gb", "gpu_h100", "gpu_h200", "gpu_b200",
+                                # HuggingFace Jobs
+                                "cpu-basic", "cpu-upgrade",
+                                "t4-small", "t4-medium",
+                                "l4x1", "l4x4",
+                                "a10g-small", "a10g-large", "a10g-largex2", "a10g-largex4",
+                                "a100-large",
+                                "v5e-1x1", "v5e-2x2", "v5e-2x4"
+                            ],
                             value="auto",
-                            info="'auto' will choose based on model type"
+                            info="Supports Modal and HuggingFace Jobs hardware. 'auto' selects cpu-basic (API) or a10g-small (local)."
                         )
                         cost_button = gr.Button("💰 Estimate", variant="primary")