refactor: remove fragile proxy detection in favor of documentation

- Remove automatic proxy detection logic from extension startup
- Remove proxy-detection.ts utility file
- Simplify error messages to suggest enabling http.electronFetch when connection issues occur
- Update documentation to focus on the solution rather than detection

As suggested by @bstrdsmkr, the proxy detection approach was fragile. VSCode extensions cannot directly use Electron fetch - they can only suggest users enable the http.electronFetch setting which tells VSCode itself to use Electron fetch internally.

Author: roomote

docs/PROXY_CONFIGURATION.md

@@ -58,14 +58,6 @@ VSCode has two different implementations for making HTTP requests:
 
 When `http.electronFetch` is `false` (default), extensions using the native fetch API may fail to route requests through your proxy correctly.
 
-## Automatic Detection
-
-Roo Code now automatically detects this configuration issue and will:
-
-1. Show a warning notification when proxy settings are detected but `http.electronFetch` is disabled
-2. Provide helpful error messages when connection errors occur
-3. Suggest the appropriate fix based on your configuration
-
 ## Supported Proxy Types
 
 With `http.electronFetch` enabled, the following proxy configurations are supported:

src/api/providers/utils/proxy-detection.ts

@@ -9,7 +9,6 @@ import delay from "delay"
 import pWaitFor from "p-wait-for"
 import { serializeError } from "serialize-error"
 
-import { detectProxyConfigurationIssue, formatProxyErrorMessage } from "../../api/providers/utils/proxy-detection"
 import {
 	type TaskLike,
 	type TaskEvents,
@@ -2222,7 +2221,19 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 
 				return
 			} else {
-				const { response } = await this.ask("api_req_failed", formatProxyErrorMessage(error))
+				let errorMsg = error.message || "API request failed"
+
+				// Add helpful message about proxy configuration if relevant
+				if (
+					errorMsg.includes("ECONNREFUSED") ||
+					errorMsg.includes("ETIMEDOUT") ||
+					errorMsg.includes("ENOTFOUND")
+				) {
+					errorMsg +=
+						"\n\nIf you're behind a proxy, try enabling the 'http.electronFetch' setting in VSCode:\n1. Open Settings (Cmd/Ctrl + ,)\n2. Search for 'http.electronFetch'\n3. Enable the setting\n4. Restart VSCode"
+				}
+
+				const { response } = await this.ask("api_req_failed", errorMsg)
 
 				if (response !== "yesButtonClicked") {
 					// This will never happen since if noButtonClicked, we will

src/core/task/Task.ts

@@ -24,7 +24,6 @@ import { ContextProxy } from "./core/config/ContextProxy"
 import { ClineProvider } from "./core/webview/ClineProvider"
 import { DIFF_VIEW_URI_SCHEME } from "./integrations/editor/DiffViewProvider"
 import { TerminalRegistry } from "./integrations/terminal/TerminalRegistry"
-import { showProxyConfigurationWarning } from "./api/providers/utils/proxy-detection"
 import { McpServerManager } from "./services/mcp/McpServerManager"
 import { CodeIndexManager } from "./services/code-index/manager"
 import { MdmService } from "./services/mdm/MdmService"
@@ -82,9 +81,6 @@ export async function activate(context: vscode.ExtensionContext) {
 	// Initialize i18n for internationalization support.
 	initializeI18n(context.globalState.get("language") ?? formatLanguage(vscode.env.language))
 
-	// Check for proxy configuration issues and show warning if needed
-	await showProxyConfigurationWarning()
-
 	// Initialize terminal shell execution handlers.
 	TerminalRegistry.initialize()