feat: add itchat-uos WeChat adapter with QR code login

- Add itchat-uos adapter supporting personal WeChat via QR code login
- Implement message/event converters for text, image, voice, sharing types
- Bridge sync itchat callbacks to async LangBot pipeline via asyncio
- Add QR login API endpoints with session management
- Add frontend QR code login dialog integration
- Fix plugin connector handler attribute check
- Use fresh Core instance per login to avoid singleton state pollution

uv.lock

@@ -1814,6 +1814,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/cb/b1/3846dd7f199d53cb17f49cba7e651e9ce294d8497c8c150530ed11865bb8/iniconfig-2.3.0-py3-none-any.whl", hash = "sha256:f631c04d2c48c52b84d0d0549c99ff3859c98df65b3101406327ecc7d53fbf12", size = 7484, upload-time = "2025-10-18T21:55:41.639Z" },
 ]
 
+[[package]]
+name = "itchat-uos"
+version = "1.5.0.dev0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "pypng" },
+    { name = "pyqrcode" },
+    { name = "requests" },
+]
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/31/2b/0be7e46195dc3c461518b046a6fb9c34c97cd2fd44847b840a0011686575/itchat_uos-1.5.0.dev0-py3-none-any.whl", hash = "sha256:0293b77cab31fa8c9c2144ea8b5636d43836f47855beba0c603ad3fb1ff89625", size = 52507, upload-time = "2022-07-14T02:38:32.507Z" },
+]
+
 [[package]]
 name = "itsdangerous"
 version = "2.2.0"
@@ -2035,6 +2048,7 @@ dependencies = [
     { name = "ebooklib" },
     { name = "gewechat-client" },
     { name = "html2text" },
+    { name = "itchat-uos" },
     { name = "langbot-plugin" },
     { name = "langchain" },
     { name = "langchain-core" },
@@ -2123,6 +2137,7 @@ requires-dist = [
     { name = "ebooklib", specifier = ">=0.18" },
     { name = "gewechat-client", specifier = ">=0.1.5" },
     { name = "html2text", specifier = ">=2024.2.26" },
+    { name = "itchat-uos", specifier = ">=1.5.0.dev0" },
     { name = "langbot-plugin", specifier = "==0.4.6" },
     { name = "langchain", specifier = ">=1.3.9" },
     { name = "langchain-core", specifier = ">=1.3.3" },
@@ -4517,6 +4532,12 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/bd/24/12818598c362d7f300f18e74db45963dbcb85150324092410c8b49405e42/pyproject_hooks-1.2.0-py3-none-any.whl", hash = "sha256:9e5c6bfa8dcc30091c74b0cf803c81fdd29d94f01992a7707bc97babb1141913", size = 10216, upload-time = "2024-09-29T09:24:11.978Z" },
 ]
 
+[[package]]
+name = "pyqrcode"
+version = "1.2.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/37/61/f07226075c347897937d4086ef8e55f0a62ae535e28069884ac68d979316/PyQRCode-1.2.1.tar.gz", hash = "sha256:fdbf7634733e56b72e27f9bce46e4550b75a3a2c420414035cae9d9d26b234d5", size = 36989, upload-time = "2016-06-20T03:28:03.411Z" }
+
 [[package]]
 name = "pyreadline3"
 version = "3.5.4"