Add Platine model and image upload feature

models/training_results.json

@@ -303,6 +303,25 @@
       "nu": 0.37
     }
   },
+  {
+    "name": "Platine",
+    "true_lambda": 1.82,
+    "true_mu": 0.62,
+    "estimated_lambda": 1.82,
+    "estimated_mu": 0.62,
+    "lambda_error_pct": 0.0,
+    "mu_error_pct": 0.0,
+    "filename": "model_l1.820_m0.620.pt",
+    "training_time_sec": 0,
+    "success": true,
+    "material_info": {
+      "lambda": 1.82,
+      "mu": 0.62,
+      "description": "M\u00e9tal pr\u00e9cieux, haute r\u00e9sistance",
+      "E_GPa": 168,
+      "nu": 0.38
+    }
+  },
   {
     "name": "Tungst\u00e8ne",
     "true_lambda": 1.95,