feat(demo-01): Add visual GUI rule editor with default rules option

- Add Visual Editor / JSON Editor mode toggle for rule editing
- Create structured GUI organized by ELIZA processing steps:
  - Pre-Substitutions (input normalization)
  - Synonyms (word groups)
  - Keywords and Patterns (with expandable cards)
  - Post-Substitutions (perspective reflection)
  - Messages (greetings, farewells, quit words, fallbacks)
- Add Default (Original Weizenbaum) option to templates dropdown
- Each section has add/delete functionality with form inputs
- Keywords are collapsible cards showing patterns and responses
- GUI syncs bidirectionally with JSON editor
- Add comprehensive CSS styling for new GUI components

Generated with Claude Code

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: jeremymanning