fix(Brainstorm): Improve system proxy support

- Switch from Msxml2.XMLHTTP to WinHttp.WinHttpRequest.5.1 for better proxy handling
- Explicitly configure SetProxy(0) to use system proxy settings
- Fix xhrHeatUp binding error (was binding xhr instead of xhrHeatUp)
- Add documentation about proxy configuration options

This ensures the Brainstorm module properly respects Windows system proxy settings
configured in Internet Options.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: snomiao

Modules/CLX-Brainstorm.ahk

@@ -2,6 +2,12 @@
 ; #Requires AutoHotkey v1.1.33
 #Include ./Modules/Lib/AHK-GDIp-Library-Compilation/ahk-v1-1/Gdip_All.ahk ; https://github.com/marius-sucan/AHK-GDIp-Library-Compilation
 
+; Note: This module uses WinHttp.WinHttpRequest.5.1 for HTTP requests
+; which automatically respects Windows system proxy settings.
+; Proxy configuration: SetProxy(0) = use system proxy settings
+; SetProxy(1) = direct connection (no proxy)
+; SetProxy(2, "proxy:port") = use specific proxy
+
 global brainstorming := false
 global brainstormed := false
 global brainstorm_origin := CLX_Config("BrainStorm", "Website", "https://brainstorm.snomiao.com")
@@ -194,9 +200,10 @@ brainstorm_quick_capture(skip_prompt:=false, defaultPrompt:="")
     ; heat up
     global brainstorm_origin
     endpoint := brainstorm_origin . "/ai/chat?ret=polling"
-    xhrHeatUp := ComObjCreate("Msxml2.XMLHTTP")
+    xhrHeatUp := ComObjCreate("WinHttp.WinHttpRequest.5.1")
     xhrHeatUp.Open("PUT", endpoint)
-    xhrHeatUp.onreadystatechange := Func("BS_heatUp_onReadyStateChange").Bind(xhr)
+    xhrHeatUp.SetProxy(0)  ; 0 = HTTPREQUEST_PROXYSETTING_PRECONFIG (use system proxy settings)
+    xhrHeatUp.onreadystatechange := Func("BS_heatUp_onReadyStateChange").Bind(xhrHeatUp)
     xhrHeatUp.Send("")
 
     clipboardContent := brainstorm_capture_window()
@@ -251,9 +258,10 @@ brainstorm_prompt(skip_prompt:=false, defaultPrompt:="")
     ; heat up
     global brainstorm_origin
     endpoint := brainstorm_origin . "/ai/chat?ret=polling"
-    xhrHeatUp := ComObjCreate("Msxml2.XMLHTTP")
+    xhrHeatUp := ComObjCreate("WinHttp.WinHttpRequest.5.1")
     xhrHeatUp.Open("PUT", endpoint)
-    xhrHeatUp.onreadystatechange := Func("BS_heatUp_onReadyStateChange").Bind(xhr)
+    xhrHeatUp.SetProxy(0)  ; 0 = HTTPREQUEST_PROXYSETTING_PRECONFIG (use system proxy settings)
+    xhrHeatUp.onreadystatechange := Func("BS_heatUp_onReadyStateChange").Bind(xhrHeatUp)
     xhrHeatUp.Send("")
 
     clipboardContent := brainstorm_copy()
@@ -314,8 +322,9 @@ brainstorm_questionPost(question, imagePath)
 {
     global brainstorm_origin
     endpoint := brainstorm_origin . "/ai/chat?ret=polling"
-    xhr := ComObjCreate("Msxml2.XMLHTTP")
+    xhr := ComObjCreate("WinHttp.WinHttpRequest.5.1")
     xhr.Open("POST", endpoint)
+    xhr.SetProxy(0)  ; 0 = HTTPREQUEST_PROXYSETTING_PRECONFIG (use system proxy settings)
     xhr.setRequestHeader("Authorization", "Bearer " . brainstormApiKey)
     global brainstorming
     if (!brainstorming) {
@@ -381,8 +390,9 @@ tokenAppend(questionId)
         return
     global brainstorm_origin
     endpoint := brainstorm_origin "/ai/" questionId
-    xhra := ComObjCreate("Msxml2.XMLHTTP")
+    xhra := ComObjCreate("WinHttp.WinHttpRequest.5.1")
     xhra.open("GET", endpoint)
+    xhra.SetProxy(0)  ; 0 = HTTPREQUEST_PROXYSETTING_PRECONFIG (use system proxy settings)
     xhra.onreadystatechange := Func("tokenAppend_onReadyStateChange").Bind(xhra)
     xhra.Send()
 }