Add global command channel rules and enhance command handling

- Introduced global command channel whitelist and blacklist in the GuildSettings model for improved command access control.
- Implemented command gate logic in the command routing to handle channel and role restrictions, providing user feedback for denied commands.
- Enhanced the CommandsManager component to support global rules and channel/role selection, improving the user interface for managing command permissions.
- Updated localization files to include new keys for global command rules and related messages, ensuring clarity in user interactions.

docs/logo/nexumi-banner.svg

@@ -5,9 +5,9 @@
       <stop offset="0.55" stop-color="#12141F"/>
       <stop offset="1" stop-color="#0A0A0D"/>
     </linearGradient>
-    <radialGradient id="glow" cx="28%" cy="48%" r="45%">
-      <stop offset="0" stop-color="#6366F1" stop-opacity="0.35"/>
-      <stop offset="0.55" stop-color="#6366F1" stop-opacity="0.12"/>
+    <radialGradient id="glow" cx="48%" cy="42%" r="42%">
+      <stop offset="0" stop-color="#6366F1" stop-opacity="0.32"/>
+      <stop offset="0.55" stop-color="#6366F1" stop-opacity="0.10"/>
       <stop offset="1" stop-color="#6366F1" stop-opacity="0"/>
     </radialGradient>
     <linearGradient id="mark" x1="0" y1="1" x2="1" y2="0">
@@ -19,40 +19,42 @@
   <rect width="1200" height="480" fill="url(#bg)"/>
   <rect width="1200" height="480" fill="url(#glow)"/>
 
-  <!-- faint network dots -->
+  <!-- faint network dots (keep away from avatar corner) -->
   <g fill="#6366F1" fill-opacity="0.18">
-    <circle cx="620" cy="90" r="3"/>
-    <circle cx="760" cy="140" r="2.5"/>
-    <circle cx="900" cy="100" r="3"/>
-    <circle cx="980" cy="200" r="2"/>
-    <circle cx="840" cy="280" r="2.5"/>
-    <circle cx="1040" cy="320" r="3"/>
-    <circle cx="700" cy="360" r="2"/>
-    <circle cx="1120" cy="160" r="2.5"/>
+    <circle cx="180" cy="70" r="2.5"/>
+    <circle cx="980" cy="80" r="3"/>
+    <circle cx="1080" cy="160" r="2.5"/>
+    <circle cx="1020" cy="280" r="2"/>
+    <circle cx="160" cy="160" r="2"/>
   </g>
-  <g stroke="#6366F1" stroke-opacity="0.12" stroke-width="1.5" fill="none">
-    <path d="M620 90 L760 140 L900 100 L980 200"/>
-    <path d="M760 140 L840 280 L700 360"/>
-    <path d="M900 100 L1120 160 L1040 320"/>
+  <g stroke="#6366F1" stroke-opacity="0.10" stroke-width="1.5" fill="none">
+    <path d="M180 70 L160 160"/>
+    <path d="M980 80 L1080 160 L1020 280"/>
   </g>
 
-  <!-- N mark — shifted up so Discord avatar does not cover it -->
-  <g transform="translate(90,-70) scale(0.92)">
-    <g fill="none" stroke="url(#mark)" stroke-linecap="round" stroke-linejoin="round">
-      <path d="M170 362 V150 L342 362 V150" stroke-width="78" stroke-opacity="0.10"/>
-      <path d="M170 362 V150 L342 362 V150" stroke-width="52" stroke-opacity="0.16"/>
-      <path d="M170 362 V150 L342 362 V150" stroke-width="30"/>
+  <!--
+    Centered lockup: N + wordmark.
+    Shifted right so Discord's bottom-left avatar does not cover the N.
+    Local N bounds ~170..342 x 150..362; scale 0.78 → ~134×165.
+  -->
+  <g transform="translate(310,-20)">
+    <g transform="scale(0.78)">
+      <g fill="none" stroke="url(#mark)" stroke-linecap="round" stroke-linejoin="round">
+        <path d="M170 362 V150 L342 362 V150" stroke-width="78" stroke-opacity="0.10"/>
+        <path d="M170 362 V150 L342 362 V150" stroke-width="52" stroke-opacity="0.16"/>
+        <path d="M170 362 V150 L342 362 V150" stroke-width="30"/>
+      </g>
+      <g fill="url(#mark)">
+        <circle cx="170" cy="150" r="34"/>
+        <circle cx="170" cy="362" r="34"/>
+        <circle cx="342" cy="362" r="34"/>
+        <circle cx="342" cy="150" r="34"/>
+      </g>
+      <circle cx="342" cy="150" r="14" fill="#C7D2FE"/>
     </g>
-    <g fill="url(#mark)">
-      <circle cx="170" cy="150" r="34"/>
-      <circle cx="170" cy="362" r="34"/>
-      <circle cx="342" cy="362" r="34"/>
-      <circle cx="342" cy="150" r="34"/>
-    </g>
-    <circle cx="342" cy="150" r="14" fill="#C7D2FE"/>
-  </g>
 
-  <!-- wordmark -->
-  <text x="560" y="200" fill="#E6E6EA" font-family="Inter, ui-sans-serif, system-ui, sans-serif" font-size="92" font-weight="700" letter-spacing="-2">Nexumi</text>
-  <text x="564" y="250" fill="#9A9AA5" font-family="Inter, ui-sans-serif, system-ui, sans-serif" font-size="28" font-weight="500">nexumi.de</text>
+    <!-- wordmark to the right of N, vertically centered to mark -->
+    <text x="320" y="195" fill="#E6E6EA" font-family="Inter, ui-sans-serif, system-ui, sans-serif" font-size="88" font-weight="700" letter-spacing="-2">Nexumi</text>
+    <text x="324" y="245" fill="#9A9AA5" font-family="Inter, ui-sans-serif, system-ui, sans-serif" font-size="26" font-weight="500">nexumi.de</text>
+  </g>
 </svg>