feat: add clipboard magic string for quick channel creation from token copy

When copying a token, users can now choose "Copy Connection String" which
encodes both the API key and server URL as a JSON clipboard payload
(type: newapi_channel_conn). When opening the channel creation form, the
clipboard is auto-detected and a banner offers to fill key + base_url,
eliminating repeated tab-switching when connecting to another new-api instance.

web/src/components/table/tokens/TokensTable.jsx

@@ -43,6 +43,7 @@ const TokensTable = (tokensData) => {
     loadingTokenKeys,
     toggleTokenVisibility,
     copyTokenKey,
+    copyTokenConnectionString,
     manageToken,
     onOpenLink,
     setEditingToken,
@@ -60,6 +61,7 @@ const TokensTable = (tokensData) => {
       loadingTokenKeys,
       toggleTokenVisibility,
       copyTokenKey,
+      copyTokenConnectionString,
       manageToken,
       onOpenLink,
       setEditingToken,
@@ -73,6 +75,7 @@ const TokensTable = (tokensData) => {
     loadingTokenKeys,
     toggleTokenVisibility,
     copyTokenKey,
+    copyTokenConnectionString,
     manageToken,
     onOpenLink,
     setEditingToken,