Move TTS server status from frontend to admin dashboard

- Removed TTS server status popup from main frontend interface
- Commented out checkTtsServer() function and all its calls
- Removed TTS configuration UI elements from index.html
- Added comprehensive TTS server monitoring to admin dashboard:
  - Configuration status (URL, API key)
  - Server health monitoring
  - Available voices display
  - Usage statistics and performance metrics
  - Real-time status updates
- Enhanced system health check to include TTS server
- Created dedicated /api/tts/status endpoint for detailed info

The TTS functionality remains fully operational for users, but status
monitoring is now exclusive to the admin dashboard for cleaner UX.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

admin/templates/dashboard.html

@@ -109,6 +109,7 @@
                             <div>
                                 <h6 class="mb-0">Whisper/TTS</h6>
                                 <span class="badge" id="ml-status">Checking...</span>
+                                <small class="d-block text-muted" id="tts-details"></small>
                             </div>
                         </div>
                     </div>
@@ -118,6 +119,54 @@
     </div>
 </div>
 
+<!-- TTS Server Status Card -->
+<div class="row mb-4">
+    <div class="col-md-12">
+        <div class="card">
+            <div class="card-header d-flex justify-content-between align-items-center">
+                <h5 class="mb-0">TTS Server Status</h5>
+                <button class="btn btn-sm btn-outline-primary" onclick="loadTTSStatus()">
+                    <i class="fas fa-sync"></i> Refresh
+                </button>
+            </div>
+            <div class="card-body">
+                <div class="row" id="tts-status-container">
+                    <div class="col-md-4">
+                        <h6>Configuration</h6>
+                        <ul class="list-unstyled mb-0">
+                            <li><strong>Status:</strong> <span id="tts-config-status" class="badge">Loading...</span></li>
+                            <li><strong>Server URL:</strong> <span id="tts-server-url">-</span></li>
+                            <li><strong>API Key:</strong> <span id="tts-api-key-status">-</span></li>
+                        </ul>
+                    </div>
+                    <div class="col-md-4">
+                        <h6>Server Health</h6>
+                        <ul class="list-unstyled mb-0">
+                            <li><strong>Health:</strong> <span id="tts-health-status" class="badge">Loading...</span></li>
+                            <li><strong>Available Voices:</strong> <span id="tts-voice-count">-</span></li>
+                            <li><strong>Error:</strong> <span id="tts-error-message" class="text-danger">-</span></li>
+                        </ul>
+                    </div>
+                    <div class="col-md-4">
+                        <h6>Usage & Performance</h6>
+                        <ul class="list-unstyled mb-0">
+                            <li><strong>Today's Requests:</strong> <span id="tts-usage-today">-</span></li>
+                            <li><strong>Avg Response Time:</strong> <span id="tts-avg-response">-</span></li>
+                            <li><strong>Total Requests:</strong> <span id="tts-usage-total">-</span></li>
+                        </ul>
+                    </div>
+                </div>
+                <div class="row mt-3" id="tts-voices-container" style="display: none;">
+                    <div class="col-md-12">
+                        <h6>Available Voices</h6>
+                        <div id="tts-voices-list" class="d-flex flex-wrap gap-2"></div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
 <!-- Charts Row 1 -->
 <div class="row mb-4">
     <div class="col-md-8">