Address Copilot and Codex bot feedback: fix regex pattern and enhance reasoning model support

Co-authored-by: PeterDaveHello <[email protected]>

Author: Copilot

src/services/apis/openai-api.mjs

@@ -165,6 +165,11 @@ export async function generateAnswersWithChatgptApiCompat(
     requestBody.n = 1
     requestBody.presence_penalty = 0
     requestBody.frequency_penalty = 0
+    // Disallow tools/functions/function calling in reasoning mode
+    delete requestBody.tools
+    delete requestBody.tool_choice
+    delete requestBody.functions
+    delete requestBody.function_call
   } else {
     // Non-reasoning models use the existing behavior
     requestBody.stream = true

src/utils/model-name-convert.mjs

@@ -169,8 +169,8 @@ export function isUsingReasoningModel(configOrSession) {
   const modelValue = getModelValue(configOrSession)
   if (!modelValue) return false
 
-  // Explicitly match o1, o3, or o4 with optional dash and suffix (e.g., o1, o1-preview, o3-mini, o4-mini)
-  if (/^(o1|o3|o4)(?:-|$)/.test(modelValue)) {
+  // Explicitly match o1, o3, or o4 as standalone or with a dash and valid suffix (e.g., o1, o1-preview, o3-mini, o4-mini)
+  if (/^(o1|o3|o4)(?:$|-[a-zA-Z][\w-]*)$/.test(modelValue)) {
     return true
   }