chore(ci): 新增 CI（前端 build→go build/vet/test→cross-compile 矩阵 + 覆盖率上报）；README 同步 M0-M11 状态/快速开始/技术栈/文档索引

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main, dev]
+  pull_request:
+    branches: [main, dev]
+
+jobs:
+  backend:
+    name: Backend (build / vet / test / cross-compile)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.26"
+
+      # `go:embed` 需要 internal/webui/dist 存在（前端先构建并拷贝）。
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+
+      - name: Build frontend (produces internal/webui/dist)
+        working-directory: frontend/web
+        run: |
+          npm ci
+          npm run build
+
+      - name: go build
+        run: go build ./...
+
+      - name: go vet
+        run: go vet ./...
+
+      - name: go test (with coverage)
+        run: go test ./... -count=1 -coverprofile=coverage.out
+
+      - name: Upload coverage
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage
+          path: coverage.out
+
+      - name: Cross-compile matrix
+        run: |
+          set -e
+          for t in "linux amd64 " "linux arm64 " "linux arm 7" "darwin amd64 " "darwin arm64 " "windows amd64 " "windows arm64 "; do
+            set -- $t
+            echo "== building $1/$2/$3 =="
+            GOOS=$1 GOARCH=$2 GOARM=$3 go build ./...
+          done
+
+  frontend:
+    name: Frontend (tsc + vite build)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+      - name: Build
+        working-directory: frontend/web
+        run: |
+          npm ci
+          npm run build