feat(govai): 0617 优化首批 — 安全/私有化/深度研究/服务层/可观测性

借鉴 odysseus 的能力设计，全程净室实现、零 AGPL 代码、不引入 AGPL 依赖。

T1 提示注入防护: pkg/promptguard 包裹外部/知识库内容为不可信数据，buildMessages 移出 system 指令区。 T2 安全 CI: .github/workflows(ci+security: govulncheck/gitleaks/actionlint/hadolint/trivy)+dependabot+.hadolint.yaml；go.mod 加 toolchain go1.25.11 修复 20 个 stdlib CVE。 T3 管理员 2FA: 迁移 000016 + RFC6238 TOTP/备份码(pkg/auth, 零依赖) + 登录流程集成(后端)。 T4 本地模型: LLM/embedding 支持本地 vLLM/Ollama(OpenAI 兼容, 鉴权头条件发送, NoAuth) + docs/local-deploy.md。 T6 深度研究: 迁移 000017 + Python research-worker(净室多步流水线, 检索避开 SearXNG) + Go research 服务/handler/路由。 T7 service 层: 新增 internal/service/{research,twofa}, 2FA 业务逻辑从胖 handler 下沉, 接口注入可单测。 T10 缓存/可观测性: internal/cache(Redis+内存, 优雅降级) 接入 store 热点列表; Prometheus 指标+/metrics; docs/openapi.yaml。 验证: go build/vet/test ./... 全绿(8 包); research-worker 12 单测过; 真实 PG 应用迁移并烟测。

.github/workflows/security.yml

@@ -0,0 +1,94 @@
+# 安全检查套件 —— 密钥扫描 / 依赖漏洞 / 工作流与镜像静态检查
+# 本文件为 GovAi 自行编写，所用工具均为宽松许可（MIT/Apache 等），
+# 在 CI 中作为独立分析器运行，不与本项目代码链接。未复制任何第三方项目配置。
+name: Security
+
+on:
+  push:
+    branches: [main, master, dev]
+  pull_request:
+  schedule:
+    - cron: "0 3 * * 1" # 每周一 03:00 UTC 定时复扫
+
+permissions:
+  contents: read
+
+concurrency:
+  group: security-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  # ---- 阻断类：发现问题应修复后再合并 ----
+  secret-scan:
+    name: 密钥扫描 (gitleaks)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # 全量历史，便于扫描历史提交中的密钥
+      - name: 安装 gitleaks
+        run: |
+          VERSION=8.18.4
+          curl -sSfL "https://github.com/gitleaks/gitleaks/releases/download/v${VERSION}/gitleaks_${VERSION}_linux_x64.tar.gz" -o gitleaks.tar.gz
+          tar -xzf gitleaks.tar.gz gitleaks
+          sudo install gitleaks /usr/local/bin/gitleaks
+      - name: 扫描
+        run: gitleaks detect --source . --redact --no-banner --verbose
+
+  go-vuln:
+    name: Go 依赖漏洞 (govulncheck)
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: server
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: server/go.mod
+          cache-dependency-path: server/go.sum
+      - name: 安装 govulncheck
+        run: go install golang.org/x/vuln/cmd/govulncheck@latest
+      - name: 扫描
+        run: govulncheck ./...
+
+  workflow-lint:
+    name: 工作流静态检查 (actionlint)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: 安装并运行 actionlint
+        run: |
+          bash <(curl -sSf https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash)
+          ./actionlint -color
+
+  docker-lint:
+    name: Dockerfile 静态检查 (hadolint)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: hadolint - ppt-worker Dockerfile
+        uses: hadolint/hadolint-action@v3.1.0
+        with:
+          dockerfile: ppt-worker/Dockerfile
+
+  # ---- 建议类：报告问题但不阻断合并 ----
+  dependency-audit:
+    name: 依赖审计 (npm audit / trivy，建议性)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: apps/web/package-lock.json
+      - name: npm audit (前端)
+        working-directory: apps/web
+        run: npm audit --audit-level=high
+        continue-on-error: true
+      - name: 安装 trivy
+        run: curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sudo sh -s -- -b /usr/local/bin
+      - name: trivy 文件系统扫描（依赖 CVE）
+        run: trivy fs --scanners vuln --severity HIGH,CRITICAL --exit-code 0 .
+        continue-on-error: true