Remove dead Gemini 1.5 models, and clean up (#4636)

* Remove dead Gemini 1.5 models, and clean up

* Remove dead models (error 404): Gemini 1.5, `gemini-2.5-pro-exp-03-25`, `gemini-2.5-flash-preview-04-17`
* Adjust the Gemini → descriptions
* Assign default models to 2.5 Pro and Sonnet 4.5 (3.5 and 3.7 will be retiring soon)
* Add `gemini-2.5-flash-image`

* Don't forget learnlm-1.5-pro

* Update default claude

* Vertex: Clean-up 2.5 preview models

* Disable thinking for 2.5-flash-image

* Bring back banana preview

* Update defaults in more places

* Add gemini preview-09-2025 and robotics-er

* unbrick my last commit

* Add gemini-robotics-er to captions

* Set max context for gemini-robotics-er

dang

---------

Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>

default/content/presets/openai/Default.json

@@ -1,7 +1,7 @@
 {
     "chat_completion_source": "openai",
     "openai_model": "gpt-4-turbo",
-    "claude_model": "claude-3-5-sonnet-20240620",
+    "claude_model": "claude-sonnet-4-5",
     "openrouter_model": "OR_Website",
     "openrouter_use_fallback": false,
     "openrouter_group_models": false,
@@ -16,8 +16,8 @@
     "custom_include_body": "",
     "custom_exclude_body": "",
     "custom_include_headers": "",
-    "google_model": "gemini-pro",
-    "vertexai_model": "gemini-2.0-flash-001",
+    "google_model": "gemini-2.5-pro",
+    "vertexai_model": "gemini-2.5-pro",
     "temperature": 1,
     "frequency_penalty": 0,
     "presence_penalty": 0,

default/content/settings.json

@@ -620,7 +620,7 @@
         },
         "wi_format": "{0}",
         "openai_model": "gpt-4-turbo",
-        "claude_model": "claude-3-5-sonnet-20240620",
+        "claude_model": "claude-sonnet-4-5",
         "ai21_model": "jamba-large",
         "openrouter_model": "OR_Website",
         "reverse_proxy": "",