Refactor WordPress integration service to use API key for connection testing

- Updated the `IntegrationService` to perform connection tests using only the API key, removing reliance on username and app password.
- Simplified health check logic and improved error messaging for better clarity.
- Added functionality to revoke API keys in the `WordPressIntegrationForm` component.
- Enhanced site settings page with a site selector and improved integration status display.
- Cleaned up unused code and improved overall structure for better maintainability.

SITE_SETTINGS_NEW_FEATURES.md

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+# Site Settings Page - New Features Added
+
+## Date: 2025-11-22
+
+### **Feature 1: Site URL Field in General Tab**
+
+Added a new "Site URL" field in the General settings tab to allow users to specify their site's URL.
+
+**Changes Made:**
+1. Added `site_url` to formData state
+2. Added field in `loadSite()` to populate from `data.domain` or `data.url`
+3. Added input field in General tab UI after the Slug field
+
+**Location in UI:**
+- **Tab:** General
+- **Position:** After "Slug" field, before "Site Type"
+- **Placeholder:** `https://example.com`
+
+---
+
+### **Feature 2: Site Selector at Top Right**
+
+Added a site selector dropdown in the page header that allows users to quickly switch between sites.
+
+**Behavior:**
+- **Only shows if user has MORE THAN 1 site**
+- Located at **top right**, same row as page title
+- Shows current site name with grid icon
+- Dropdown lists all user's sites
+- Clicking a site navigates to that site's settings page
+- Preserves current tab when switching sites
+
+**Implementation Details:**
+1. Added new imports: `fetchSites`, `Site`, `ChevronDownIcon`, `Dropdown`, `DropdownItem`
+2. Added state for sites list and dropdown
+3. Added `loadSites()` function to fetch all user sites
+4. Added `handleSiteSelect()` to navigate to selected site
+5. Modified header layout from `flex items-center gap-4` to `flex items-center justify-between gap-4`
+6. Added site selector component with conditional rendering
+
+**Visual Design:**
+- Matches homepage site selector styling
+- Shows checkmark for currently selected site
+- Responsive hover states
+- Dark mode support
+- Smooth animations (chevron rotation)
+
+---
+
+## Files Modified
+
+**File:** `/data/app/igny8/frontend/src/pages/Sites/Settings.tsx`
+
+### Changes:
+1. ✅ Added imports for site selector components
+2. ✅ Added site selector state variables
+3. ✅ Added `site_url` to formData
+4. ✅ Added loadSites() and handleSiteSelect() functions  
+5. ✅ Added Site URL input field in General tab
+6. ✅ Added site selector component in header
+7. ✅ Modified header layout for proper spacing
+
+---
+
+## Testing
+
+Tested on: `https://app.igny8.com/sites/15/settings?tab=general`
+
+✅ Site URL field displays correctly
+✅ Site selector appears in top right (when user has > 1 site)
+✅ Can enter site URL
+✅ Can switch between sites using selector
+✅ Tab preservation works when switching sites
+✅ No linting errors
+
+---
+
+## Notes
+
+- Site selector only appears if user has more than 1 site (as requested)
+- Site URL field is optional (no validation added yet)
+- Site URL data is saved to backend when user clicks "Save Changes"
+- The site selector maintains the same tab when switching (e.g., if on "SEO Meta Tags" tab, switching sites will load that site's "SEO Meta Tags" tab)
+