Add multi-guild Discord bot support with auto-setup

- Bot creates category and channels automatically when joining a server
- Channel structure: info, status, alerts, updates, diskussion, requests (forum)
- Add guild_settings database table for per-server configuration
- Add Discord bot invite button to Dashboard
- Add display settings API functions
- Add comprehensive Discord bot documentation

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

gsm-frontend/src/api.js

@@ -249,3 +249,27 @@ export async function getActivityLog(token, limit = 100) {
     headers: { Authorization: `Bearer ${token}` },
   })
 }
+
+// Display Settings
+export async function getAllDisplaySettings(token) {
+  return fetchAPI('/servers/display-settings', {
+    headers: token ? { Authorization: `Bearer ${token}` } : {},
+  })
+}
+
+export async function getDisplaySettings(token, serverId) {
+  return fetchAPI(`/servers/${serverId}/display-settings`, {
+    headers: { Authorization: `Bearer ${token}` },
+  })
+}
+
+export async function saveDisplaySettings(token, serverId, address, hint) {
+  return fetchAPI(`/servers/${serverId}/display-settings`, {
+    method: 'PUT',
+    headers: { Authorization: `Bearer ${token}` },
+    body: JSON.stringify({ address, hint }),
+  })
+}
+
+// Alias for backwards compatibility
+export const setDisplaySettings = saveDisplaySettings