refactor(cli): remove ChatGPT subscription check from installer

- Remove chatgpt option from CLI args and types
- Remove ChatGPT prompt from TUI installer flow
- Update config detection to not include hasChatGPT
- Update related tests

src/cli/types.ts

@@ -4,7 +4,6 @@ export type BooleanArg = "no" | "yes"
 export interface InstallArgs {
   tui: boolean
   claude?: ClaudeSubscription
-  chatgpt?: BooleanArg
   gemini?: BooleanArg
   copilot?: BooleanArg
   skipAuth?: boolean
@@ -13,7 +12,6 @@ export interface InstallArgs {
 export interface InstallConfig {
   hasClaude: boolean
   isMax20: boolean
-  hasChatGPT: boolean
   hasGemini: boolean
   hasCopilot: boolean
 }
@@ -28,7 +26,6 @@ export interface DetectedConfig {
   isInstalled: boolean
   hasClaude: boolean
   isMax20: boolean
-  hasChatGPT: boolean
   hasGemini: boolean
   hasCopilot: boolean
 }