Fix OPDS: add auth token to URL and hot-update in-memory servers

- Append ?token= auth param to OPDS catalog URL
- Replace any existing stale Bookhoard entry (with or without token)
- Hot-update OPDS plugin's in-memory servers table so catalog
  appears immediately without restarting KOReader

main.lua

@@ -578,28 +578,49 @@ function Bookhoard:startRegistrationPoll()
 end
 
 function Bookhoard:setupOPDS()
-    if not self.settings.server_url or not self.settings.device_id then
+    if not self.settings.server_url or not self.settings.device_id
+        or not self.settings.auth_token then
         return false
     end
 
-    local opds_url = self.settings.server_url
+    local opds_base_url = self.settings.server_url
         .. "/opds/devices/" .. self.settings.device_id .. "/catalog"
+    local opds_url = opds_base_url .. "?token=" .. self.settings.auth_token
+
     local opds_settings_file = DataStorage:getSettingsDir() .. "/opds.lua"
     local opds_settings = LuaSettings:open(opds_settings_file)
     local servers = opds_settings:readSetting("servers", {})
 
-    for _, server in ipairs(servers) do
-        if server.url == opds_url then
-            return true
+    local found = false
+    for i, server in ipairs(servers) do
+        if server.url and (
+            server.url == opds_url
+            or server.url == opds_base_url
+            or server.url:startswith(opds_base_url .. "?")
+        ) then
+            servers[i] = {
+                title = "Bookhoard",
+                url = opds_url,
+            }
+            found = true
+            break
         end
     end
 
+    if not found then
         table.insert(servers, {
             title = "Bookhoard",
             url = opds_url,
         })
+    end
+
     opds_settings:saveSetting("servers", servers)
     opds_settings:flush()
+
+    if self.ui.opds then
+        self.ui.opds.servers = servers
+    end
+
     return true
 end