[fix] CI: 修复 WebSocket 空闲超时测试竞态 + GitHub Actions io_uring 封禁

1. test_websocket: server.stop() 前轮询等待 onDisconnect 完成，
   消除 sanitizer 构建下 ioContext_.stop() 抢占回调的竞态
2. CMake: 新增 HICAL_DISABLE_IO_URING 选项（默认 OFF）
3. ci.yml: Linux 构建传入 -DHICAL_DISABLE_IO_URING=ON，
   因 GitHub Actions 自 2025-04 起 seccomp 封禁 io_uring syscall，
   Boost 1.83 的 random_access_file 无线程池 fallback 导致 ENOMEM

Author: Hical61

.github/workflows/ci.yml

@@ -63,7 +63,8 @@ jobs:
             -DCMAKE_C_COMPILER=${{ matrix.cc }} \
             -DCMAKE_CXX_COMPILER=${{ matrix.cxx }} \
             -DCMAKE_C_COMPILER_LAUNCHER=ccache \
-            -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+            -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
+            -DHICAL_DISABLE_IO_URING=ON
 
       - name: Build (Linux)
         if: runner.os == 'Linux' && matrix.compiler != 'clang'
@@ -83,7 +84,8 @@ jobs:
             -DCMAKE_C_COMPILER_LAUNCHER=ccache \
             -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
             -DCMAKE_CXX_FLAGS="-fsanitize=address,undefined -fno-omit-frame-pointer" \
-            -DCMAKE_EXE_LINKER_FLAGS="-fsanitize=address,undefined"
+            -DCMAKE_EXE_LINKER_FLAGS="-fsanitize=address,undefined" \
+            -DHICAL_DISABLE_IO_URING=ON
 
       - name: Build with sanitizers (Clang)
         if: matrix.compiler == 'clang'
@@ -109,7 +111,8 @@ jobs:
             -DCMAKE_CXX_COMPILER=${{ matrix.cxx }} \
             -DCMAKE_CXX_FLAGS="--coverage" \
             -DCMAKE_C_FLAGS="--coverage" \
-            -DCMAKE_EXE_LINKER_FLAGS="--coverage"
+            -DCMAKE_EXE_LINKER_FLAGS="--coverage" \
+            -DHICAL_DISABLE_IO_URING=ON
           cmake --build build-cov -j$(nproc)
 
       - name: Run tests for coverage

src/CMakeLists.txt

@@ -55,11 +55,18 @@ if(WIN32)
 endif()
 
 # Linux 需要链接 liburing（Boost.Asio random_access_file 依赖 io_uring）
+# GitHub Actions 自 2025-04 起封禁 io_uring syscall，CI 中需 -DHICAL_DISABLE_IO_URING=ON
 if(UNIX AND NOT APPLE)
-    find_library(URING_LIB uring)
-    if(URING_LIB)
-        target_link_libraries(hical_core PRIVATE ${URING_LIB})
-        target_compile_definitions(hical_core PUBLIC BOOST_ASIO_HAS_IO_URING)
+    option(HICAL_DISABLE_IO_URING "Disable io_uring backend (for environments where io_uring is blocked)" OFF)
+
+    if(NOT HICAL_DISABLE_IO_URING)
+        find_library(URING_LIB uring)
+        if(URING_LIB)
+            target_link_libraries(hical_core PRIVATE ${URING_LIB})
+            target_compile_definitions(hical_core PUBLIC BOOST_ASIO_HAS_IO_URING)
+        endif()
+    else()
+        message(STATUS "io_uring disabled via HICAL_DISABLE_IO_URING")
     endif()
 endif()