fix(deps): add dingtalk-stream to optional dependencies

Cherry-picked from PR #2065 by @ygd58. Fixes #2062.

dingtalk-stream was required by gateway/platforms/dingtalk.py but not
listed in pyproject.toml, causing ImportError on pip install .[all].
Adds dingtalk extras group following the same pattern as slack/sms/etc.

pyproject.toml

@@ -60,6 +60,7 @@ mcp = ["mcp>=1.2.0"]
 homeassistant = ["aiohttp>=3.9.0"]
 sms = ["aiohttp>=3.9.0"]
 acp = ["agent-client-protocol>=0.8.1,<1.0"]
+dingtalk = ["dingtalk-stream>=0.1.0"]
 rl = [
   "atroposlib @ git+https://github.com/NousResearch/atropos.git",
   "tinker @ git+https://github.com/thinking-machines-lab/tinker.git",
@@ -84,6 +85,7 @@ all = [
   "hermes-agent[sms]",
   "hermes-agent[acp]",
   "hermes-agent[voice]",
+  "hermes-agent[dingtalk]",
 ]
 
 [project.scripts]