refactor: removed subclass override when the base class should be resolving the model name

refactor: always disable "stream"

tests/gemini_cassettes/chat_cross/step1_gemini25_flash_number/mldev.json

@@ -38,12 +38,12 @@
           "content-type": "application/json; charset=UTF-8",
           "vary": "Origin, X-Origin, Referer",
           "content-encoding": "gzip",
-          "date": "Fri, 03 Oct 2025 18:58:34 GMT",
+          "date": "Sat, 04 Oct 2025 06:23:34 GMT",
           "server": "scaffolding on HTTPServer2",
           "x-xss-protection": "0",
           "x-frame-options": "SAMEORIGIN",
           "x-content-type-options": "nosniff",
-          "server-timing": "gfet4t7; dur=21591",
+          "server-timing": "gfet4t7; dur=1401",
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
           "transfer-encoding": "chunked"
         },
@@ -66,17 +66,24 @@
             "usageMetadata": {
               "promptTokenCount": 1085,
               "candidatesTokenCount": 1,
-              "totalTokenCount": 3091,
+              "totalTokenCount": 1154,
+              "cachedContentTokenCount": 994,
               "promptTokensDetails": [
                 {
                   "modality": "TEXT",
                   "tokenCount": 1085
                 }
               ],
-              "thoughtsTokenCount": 2005
+              "cacheTokensDetails": [
+                {
+                  "modality": "TEXT",
+                  "tokenCount": 994
+                }
+              ],
+              "thoughtsTokenCount": 68
             },
             "modelVersion": "gemini-2.5-flash",
-            "responseId": "2hzgaPuTEsSlxN8PrIuRUA"
+            "responseId": "Zr3gaPiqNLXtkdUP7t7J0QU"
           }
         ],
         "byte_segments": [],
@@ -87,12 +94,12 @@
                 "content-type": "application/json; charset=UTF-8",
                 "vary": "Origin, X-Origin, Referer",
                 "content-encoding": "gzip",
-                "date": "Fri, 03 Oct 2025 18:58:34 GMT",
+                "date": "Sat, 04 Oct 2025 06:23:34 GMT",
                 "server": "scaffolding on HTTPServer2",
                 "x-xss-protection": "0",
                 "x-frame-options": "SAMEORIGIN",
                 "x-content-type-options": "nosniff",
-                "server-timing": "gfet4t7; dur=21591",
+                "server-timing": "gfet4t7; dur=1401",
                 "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
                 "transfer-encoding": "chunked"
               }
@@ -112,8 +119,15 @@
               }
             ],
             "model_version": "gemini-2.5-flash",
-            "response_id": "2hzgaPuTEsSlxN8PrIuRUA",
+            "response_id": "Zr3gaPiqNLXtkdUP7t7J0QU",
             "usage_metadata": {
+              "cache_tokens_details": [
+                {
+                  "modality": "TEXT",
+                  "token_count": 994
+                }
+              ],
+              "cached_content_token_count": 994,
               "candidates_token_count": 1,
               "prompt_token_count": 1085,
               "prompt_tokens_details": [
@@ -122,8 +136,8 @@
                   "token_count": 1085
                 }
               ],
-              "thoughts_token_count": 2005,
-              "total_token_count": 3091
+              "thoughts_token_count": 68,
+              "total_token_count": 1154
             }
           }
         ]