fix(flutter): voice OAuth sheet shows correct channel (Feishu vs DingTalk)

The _showOAuthBottomSheet title/subtitle were hardcoded to 钉钉. Now detects
channel from the URL (feishu.cn → 飞书, else → 钉钉) and shows correct text
and button color (#3370FF for Feishu, #1677FF for DingTalk).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

it0_app/lib/features/agent_call/presentation/pages/agent_call_page.dart

@@ -309,6 +309,10 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
 
   /// Show DingTalk OAuth authorization card pushed by iAgent.
   void _showOAuthBottomSheet(String url, String instanceName) {
+    final isFeishu = url.contains('feishu.cn') || url.contains('larksuite.com');
+    final channelName = isFeishu ? '飞书' : '钉钉';
+    final buttonColor = isFeishu ? const Color(0xFF3370FF) : const Color(0xFF1677FF);
+
     showModalBottomSheet(
       context: context,
       backgroundColor: const Color(0xFF1A1D2E),
@@ -331,7 +335,7 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
             const Text('🦞', style: TextStyle(fontSize: 48)),
             const SizedBox(height: 12),
             Text(
-              '授权「$instanceName」接入钉钉',
+              '授权「$instanceName」接入$channelName',
               style: const TextStyle(
                 color: Colors.white,
                 fontSize: 18,
@@ -340,9 +344,9 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
               textAlign: TextAlign.center,
             ),
             const SizedBox(height: 8),
-            const Text(
-              '点击下方按钮，在钉钉中一键完成授权绑定',
-              style: TextStyle(color: Colors.white54, fontSize: 14),
+            Text(
+              '点击下方按钮，在$channelName中一键完成授权绑定',
+              style: const TextStyle(color: Colors.white54, fontSize: 14),
               textAlign: TextAlign.center,
             ),
             const SizedBox(height: 24),
@@ -351,7 +355,7 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
               height: 52,
               child: ElevatedButton(
                 style: ElevatedButton.styleFrom(
-                  backgroundColor: const Color(0xFF1677FF),
+                  backgroundColor: buttonColor,
                   shape: RoundedRectangleBorder(
                     borderRadius: BorderRadius.circular(12),
                   ),