feat(cli): add interactive install command

Related to #153

Co-authored-by: Taegeon Alan Go <32065632+gtg7784@users.noreply.github.com>

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src/cli/types.ts

@@ -0,0 +1,31 @@
+export type ClaudeSubscription = "no" | "yes" | "max20"
+export type BooleanArg = "no" | "yes"
+
+export interface InstallArgs {
+  tui: boolean
+  claude?: ClaudeSubscription
+  chatgpt?: BooleanArg
+  gemini?: BooleanArg
+  skipAuth?: boolean
+}
+
+export interface InstallConfig {
+  hasClaude: boolean
+  isMax20: boolean
+  hasChatGPT: boolean
+  hasGemini: boolean
+}
+
+export interface ConfigMergeResult {
+  success: boolean
+  configPath: string
+  error?: string
+}
+
+export interface DetectedConfig {
+  isInstalled: boolean
+  hasClaude: boolean
+  isMax20: boolean
+  hasChatGPT: boolean
+  hasGemini: boolean
+}