Enhance client reload process with new OpenAI compatibility support

- Added handling for OpenAI-compatible providers during client reload.
- Implemented client unregistration for old clients during reload.
- Improved logging for detailed client reload insights.

Expand `AuthDir` handling to support tilde (`~`) for home directory resolution

- Added logic to replace `~` with the user's home directory in `AuthDir`.
- Prevents errors when using `~` in configuration paths.

internal/client/claude_client.go

@@ -343,6 +343,10 @@ func (c *ClaudeClient) SaveTokenToFile() error {
 //   - error: An error if the refresh operation fails, nil otherwise.
 func (c *ClaudeClient) RefreshTokens(ctx context.Context) error {
 	// Check if we have a valid refresh token
+	if c.apiKeyIndex != -1 {
+		return fmt.Errorf("no refresh token available")
+	}
+
 	if c.tokenStorage == nil || c.tokenStorage.(*claude.ClaudeTokenStorage).RefreshToken == "" {
 		return fmt.Errorf("no refresh token available")
 	}