Refactor IGNY8 Bridge to use API key authentication exclusively

- Removed email/password authentication and related settings from the plugin.
- Updated API connection logic to utilize only the API key for authentication.
- Simplified the admin interface by removing webhook-related settings and messages.
- Enhanced the settings page with improved UI and status indicators for API connection.
- Added a new REST API endpoint to check plugin status and connection health.
- Updated styles for a modernized look and feel across the admin interface.

igny8-wp-plugin/PHASE1-COMPLETE.md

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+# Phase 1 Complete: Authentication Simplification ✅
+
+## Changes Made
+
+### 1. API Connection Card (lines 76-149)
+**Before:**
+- Email field
+- Password field  
+- API key field (optional)
+
+**After:**
+- ✅ API key field ONLY (required)
+- ✅ When connected: Shows masked key (••••••••) in disabled field
+- ✅ Revoke button inline below masked key
+
+### 2. Connection Status Card (lines 152-239)
+**Before:**
+- "Enable Sync Operations" checkbox
+- "Enable Two-Way Sync" checkbox
+- Email display
+- Site ID display
+
+**After:**
+- ✅ Single toggle: "Enable Communication"
+- ✅ Shows "Connected" (green) or "Disconnected" (gray)
+- ✅ Description: "Controls whether plugin can communicate with IGNY8. API key stays connected but no data is synced when disabled."
+
+### 3. Removed Cards
+**Deleted:**
+- ❌ Webhook Configuration card (lines 454-489)
+- ❌ Link Queue card (lines 492-521)  
+- ❌ Recent Webhook Activity card (lines 523-552)
+
+## Key Design Decisions
+
+### Two-Level Control System
+1. **API Key** = Authentication layer (connect/disconnect)
+2. **Toggle** = Communication layer (enable/disable data flow)
+
+This means:
+- API key connected + toggle ON = Full sync active
+- API key connected + toggle OFF = No sync, but API remains authenticated
+- No API key = Cannot connect at all
+
+### Why This Works
+- Simpler for users (no email/password confusion)
+- Consistent with IGNY8 app authentication
+- Toggle provides quick on/off without losing API key
+- Matches backend indicator logic
+
+## Files Modified
+1. `/admin/settings.php` - Removed 200+ lines, added new simplified UI
+
+## Next Steps: Phase 2
+- Enhance Sync Operations UI with counts
+- Add detailed statistics
+- Match IGNY8 brand colors
+- Add progress indicators
+
+## Status: ✅ COMPLETE
+All Phase 1 tasks done. Ready for Phase 2.
+