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/TokensColumnDefs.jsx

@@ -116,6 +116,8 @@ const renderTokenKey = (
   loadingTokenKeys,
   toggleTokenVisibility,
   copyTokenKey,
+  copyTokenConnectionString,
+  t,
 ) => {
   const revealed = !!showKeys[record.id];
   const loading = !!loadingTokenKeys[record.id];
@@ -145,18 +147,35 @@ const renderTokenKey = (
                 await toggleTokenVisibility(record);
               }}
             />
-            <Button
-              theme='borderless'
-              size='small'
-              type='tertiary'
-              icon={<IconCopy />}
-              loading={loading}
-              aria-label='copy token key'
-              onClick={async (e) => {
-                e.stopPropagation();
-                await copyTokenKey(record);
-              }}
-            />
+            <Dropdown
+              trigger='click'
+              position='bottomRight'
+              clickToHide
+              menu={[
+                {
+                  node: 'item',
+                  name: t('复制密钥'),
+                  onClick: () => copyTokenKey(record),
+                },
+                {
+                  node: 'item',
+                  name: t('复制连接信息'),
+                  onClick: () => copyTokenConnectionString(record),
+                },
+              ]}
+            >
+              <Button
+                theme='borderless'
+                size='small'
+                type='tertiary'
+                icon={<IconCopy />}
+                loading={loading}
+                aria-label='copy token key'
+                onClick={async (e) => {
+                  e.stopPropagation();
+                }}
+              />
+            </Dropdown>
           </div>
         }
       />
@@ -444,6 +463,7 @@ export const getTokensColumns = ({
   loadingTokenKeys,
   toggleTokenVisibility,
   copyTokenKey,
+  copyTokenConnectionString,
   manageToken,
   onOpenLink,
   setEditingToken,
@@ -484,6 +504,8 @@ export const getTokensColumns = ({
           loadingTokenKeys,
           toggleTokenVisibility,
           copyTokenKey,
+          copyTokenConnectionString,
+          t,
         ),
     },
     {