Enhance SEO and feedback features across the application

- Updated index.html with improved meta tags for SEO, including author and theme color.
- Added a feedback dialog in ImprintContainer.vue for user feedback submission.
- Refactored LoginForm.vue to utilize a utility for cookie management, simplifying profile persistence.
- Introduced new routes and schemas for feedback in the router and server, enhancing SEO and user experience.
- Improved ChatView.vue with better error handling and command table display.
- Implemented feedback API endpoints in server routes for managing user feedback submissions and admin access.

These changes collectively improve the application's SEO, user interaction, and feedback management capabilities.

client/src/components/ImprintContainer.vue

@@ -1,8 +1,16 @@
 <template>
   <div class="imprint-container">
     <a href="/partners">Partner</a>
+    <a href="#" @click.prevent="showFeedback = true">Feedback</a>
     <a href="#" @click.prevent="showImprint = true">Impressum</a>
     
+    <div v-if="showFeedback" class="imprint-dialog" @click.self="showFeedback = false">
+      <div class="feedback-dialog-content">
+        <button class="close-button" @click="showFeedback = false">×</button>
+        <FeedbackPanel :show-hero="false" :embedded="true" />
+      </div>
+    </div>
+
     <div v-if="showImprint" class="imprint-dialog" @click.self="showImprint = false">
       <div class="imprint-content">
         <button class="close-button" @click="showImprint = false">×</button>
@@ -14,8 +22,10 @@
 
 <script setup>
 import { ref } from 'vue';
+import FeedbackPanel from './FeedbackPanel.vue';
 
 const showImprint = ref(false);
+const showFeedback = ref(false);
 
 const imprintText = `
 <h1>Imprint</h1>
@@ -75,6 +85,18 @@ Thanks for the flag icons to <a href="https://flagpedia.net">flagpedia.net</a>
   box-shadow: 0 24px 60px rgba(18, 26, 21, 0.18);
 }
 
+.feedback-dialog-content {
+  width: min(1100px, 96vw);
+  max-height: 88vh;
+  overflow: auto;
+  background: #f4f7f5;
+  border: 1px solid #d7dfd9;
+  border-radius: 16px;
+  padding: 20px;
+  position: relative;
+  box-shadow: 0 24px 60px rgba(18, 26, 21, 0.18);
+}
+
 .close-button {
   position: absolute;
   top: 10px;