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Problem: - On first launch, McpRoot::default() created `servers: None` - McpService::get_all_servers() would incorrectly return error "old structure detected" - This confused new users who had no legacy MCP data Root Cause: - Derived Default trait sets Option<T> fields to None - New installations should start with v3.7.0 structure immediately Solution: - Explicitly implement Default for McpRoot - Initialize `servers: Some(HashMap::new())` for v3.7.0+ structure - Legacy fields (claude/codex/gemini) remain empty, only used for deserializing old configs Impact: - First-time users get correct v3.7.0 structure immediately - migrate_mcp_to_unified() correctly detects already-migrated state - No false "old structure" errors on fresh installs