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fix(factory): address concurrency concern with context-based visited tracking

Move visited map from Factory-level sync.Map to per-call context-based
tracking. Each top-level FromExistingXxx call creates its own visited
map, passed via context to recursive calls including WithExistingXxx
and AddExistingXxx modifiers.

This ensures:
- Concurrent goroutines have isolated visited maps (no cross-contamination)
- Recursive chain remains intact (context carries visited through all calls)
- Regular map replaces sync.Map (only single-goroutine access needed)

Signed-off-by: wucm667 <stevenwucongmin@gmail.com>