ci: 加 GitHub Actions —— Go/前端/mcp-py 自动化测试

工程保障地基：每次 push / PR 自动跑回归，防止改动悄悄破坏现有功能。
- go：4 模块 build + vet + test（bus 用内嵌 NATS，无需外部服务）
- web：desktop/frontend + admin 各跑 npm ci + tsc --noEmit（矩阵并行）
- py：mcp-py pip install -e . + sandbox 守卫测试（pytest，缺则 fallback harness）
带 concurrency 取消旧运行、npm/pip/go 缓存。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,70 @@
+name: CI
+
+on:
+  push:
+    branches: [main, dev]
+  pull_request:
+    branches: [main, dev]
+
+# 同一分支新 push 取消上一次未完成的运行，省 CI 时间。
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  go:
+    name: Go · build + vet + test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.25"
+          cache-dependency-path: "**/go.sum"
+      - name: build + vet + test（4 模块；bus 用内嵌 NATS，无需外部服务）
+        run: |
+          set -e
+          for m in sundynix-shared sundynix-gateway sundynix-dispatcher sundynix-mcp-go; do
+            echo "::group::$m"
+            (cd "$m" && go build ./... && go vet ./... && go test ./...)
+            echo "::endgroup::"
+          done
+
+  web:
+    name: Frontend · tsc
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        dir: [sundynix-desktop/frontend, sundynix-admin]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: npm
+          cache-dependency-path: ${{ matrix.dir }}/package-lock.json
+      - name: install + typecheck
+        working-directory: ${{ matrix.dir }}
+        run: |
+          npm ci
+          npx tsc --noEmit
+
+  py:
+    name: mcp-py · sandbox guard
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+          cache: pip
+      - name: install + test（无 Docker 时测降级路径）
+        working-directory: sundynix-mcp-py
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -e . pytest
+          PYTHONPATH=src:tests python -m pytest tests/ -q || \
+          PYTHONPATH=src:tests python -c "import test_sandbox as t; \
+            fns=[getattr(t,n) for n in dir(t) if n.startswith('test_')]; \
+            [ (f(),print('PASS',f.__name__)) for f in fns ]; print(f'{len(fns)} passed')"