W17: extract ai_common shared module + fix anthropic data race + brace bugs

- New plugins_upper/ai_common/ static library: shared PluginConfig, ToolCallAccum,
  StreamContext, secure_zero, extract_host_port, serialize_tool_calls, free_chat_result
- Refactored openai/anthropic plugins to use dstalk_ai:: namespace from ai_common
- Fixed anthropic g_config raw pointer → std::atomic (data race)
- Added SSE parse error counter with threshold abort (kMaxSseParseErrors=5)
- Fixed missing closing brace in both plugins' error-body catch block
- Updated test targets: ai_common include path + link, using namespace dstalk_ai
- plugin_loader_test: added stub_unreg + service_registry.cpp for unregister_service
- Includes pre-existing uncommitted changes from prior waves

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

scripts/ci-build.sh

@@ -7,22 +7,65 @@ BUILD_DIR="${PROJECT_DIR}/build"
 echo "=== dstalk CI Build ==="
 echo "Project: ${PROJECT_DIR}"
 
-# 创建构建目录
+# --- Find conan: prefer tools/ local install, fallback to PATH ---
+CONAN=""
+for candidate in \
+    "${PROJECT_DIR}/tools/.venv/bin/conan" \
+    "${PROJECT_DIR}/tools/.venv/Scripts/conan" \
+    "${PROJECT_DIR}/tools/.venv/Scripts/conan.exe"; do
+    if [ -x "${candidate}" ]; then
+        CONAN="${candidate}"
+        break
+    fi
+done
+if [ -z "${CONAN}" ] && command -v conan &>/dev/null; then
+    CONAN="conan"
+fi
+if [ -z "${CONAN}" ]; then
+    echo "ERROR: conan not found in tools/ or PATH" >&2
+    exit 1
+fi
+echo "Using conan: ${CONAN}"
+
+# --- Detect conan profile ---
+echo "--- Conan Profile Detect ---"
+"${CONAN}" profile detect --force
+
+# --- Install dependencies ---
+echo "--- Conan Install ---"
 mkdir -p "${BUILD_DIR}"
 cd "${BUILD_DIR}"
+"${CONAN}" install "${PROJECT_DIR}/deps/" --build=missing -s build_type=Release
 
-# CMake 配置
+# --- Find conan toolchain ---
+TOOLCHAIN=""
+for candidate in \
+    "Release/generators/conan_toolchain.cmake" \
+    "build/Release/generators/conan_toolchain.cmake"; do
+    if [ -f "${candidate}" ]; then
+        TOOLCHAIN="$(pwd)/${candidate}"
+        break
+    fi
+done
+if [ -z "${TOOLCHAIN}" ]; then
+    echo "ERROR: conan_toolchain.cmake not found" >&2
+    exit 1
+fi
+echo "Toolchain: ${TOOLCHAIN}"
+
+# --- CMake configure ---
 echo "--- CMake Configure ---"
 cmake "${PROJECT_DIR}" -G Ninja \
     -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN}" \
     -DDSTALK_BUILD_TESTS=ON \
     -DDSTALK_BUILD_GUI=OFF
 
-# 编译
+# --- Build ---
 echo "--- Build ---"
 cmake --build . --parallel
 
-# 运行测试
+# --- Test ---
 echo "--- Test ---"
 ctest --output-on-failure --parallel 4