Use OpenAI-compatible /v1/models endpoint by default (#17689)

* refactor: Data fetching via stores

* chore: update webui build output

* refactor: Use OpenAI compat `/v1/models` endpoint by default to list models

* chore: update webui build output

* chore: update webui build output

tools/server/webui/docs/flows/data-flow-simplified-router-mode.md

@@ -15,7 +15,7 @@ sequenceDiagram
     Stores->>DB: load conversations
     Stores->>API: GET /props
     API-->>Stores: {role: "router"}
-    Stores->>API: GET /models
+    Stores->>API: GET /v1/models
     API-->>Stores: models[] with status (loaded/available)
     loop each loaded model
         Stores->>API: GET /props?model=X
@@ -28,7 +28,7 @@ sequenceDiagram
     alt model not loaded
         Stores->>API: POST /models/load
         loop poll status
-            Stores->>API: GET /models
+            Stores->>API: GET /v1/models
             API-->>Stores: check if loaded
         end
         Stores->>API: GET /props?model=X

tools/server/webui/docs/flows/models-flow.md

@@ -56,7 +56,7 @@ sequenceDiagram
     UI->>modelsStore: fetchRouterModels()
     activate modelsStore
     modelsStore->>ModelsSvc: listRouter()
-    ModelsSvc->>API: GET /models
+    ModelsSvc->>API: GET /v1/models
     API-->>ModelsSvc: ApiRouterModelsListResponse
     Note right of API: {data: [{id, status, path, in_cache}]}
     modelsStore->>modelsStore: routerModels = $state(data)
@@ -132,7 +132,7 @@ sequenceDiagram
     loop poll every 500ms (max 60 attempts)
         modelsStore->>modelsStore: fetchRouterModels()
         modelsStore->>ModelsSvc: listRouter()
-        ModelsSvc->>API: GET /models
+        ModelsSvc->>API: GET /v1/models
         API-->>ModelsSvc: models[]
         modelsStore->>modelsStore: getModelStatus(modelId)
         alt status === LOADED
@@ -165,7 +165,7 @@ sequenceDiagram
     modelsStore->>modelsStore: pollForModelStatus(modelId, UNLOADED)
     loop poll until unloaded
         modelsStore->>ModelsSvc: listRouter()
-        ModelsSvc->>API: GET /models
+        ModelsSvc->>API: GET /v1/models
     end
 
     modelsStore->>modelsStore: modelLoadingStates.set(modelId, false)