diff --git a/.gitea/workflows/ci-cd.yml b/.gitea/workflows/ci-cd.yml
index 50c56a4f7..3e1306796 100644
--- a/.gitea/workflows/ci-cd.yml
+++ b/.gitea/workflows/ci-cd.yml
@@ -101,6 +101,53 @@ jobs:
           bandit --version
           pytest --version
 
+      - name: Secret detection (gitleaks)
+        shell: sh
+        run: |
+          set -eu
+          echo "=== Installing gitleaks ==="
+          # 优先尝试 GitHub release，失败则用国内镜像
+          GITLEAKS_VERSION="8.18.4"
+          install_gitleaks() {
+            local url="$1"
+            curl -sSL -f -o /tmp/gitleaks.tar.gz "$url" || return 1
+            tar -xzf /tmp/gitleaks.tar.gz -C /tmp gitleaks || return 1
+            chmod +x /tmp/gitleaks || return 1
+            /tmp/gitleaks version || return 1
+            return 0
+          }
+          if ! install_gitleaks "https://github.com/gitleaks/gitleaks/releases/download/v${GITLEAKS_VERSION}/gitleaks_${GITLEAKS_VERSION}_linux_x64.tar.gz"; then
+            echo "GitHub release failed, trying mirror..."
+            if ! install_gitleaks "https://gitee.com/mirrors/gitleaks/releases/download/v${GITLEAKS_VERSION}/gitleaks_${GITLEAKS_VERSION}_linux_x64.tar.gz"; then
+              echo "WARN: Failed to install gitleaks from all sources, skipping secret scan"
+              exit 0
+            fi
+          fi
+          echo ""
+          echo "=== Running gitleaks scan ==="
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            # PR触发: 增量扫描
+            echo "PR mode: scanning changed files"
+            EXIT_CODE=0
+            /tmp/gitleaks detect --source . --config .gitleaks.toml --verbose --exit-code 1 --log-opts="origin/${{ github.base_ref }}..HEAD" || EXIT_CODE=$?
+            if [ "$EXIT_CODE" = "1" ]; then
+              echo "ERROR: Secrets detected! Check the scan report above."
+              echo "If these are false positives, add them to .gitleaks.toml allowlist."
+              exit 1
+            fi
+          else
+            # Push触发: 全量扫描
+            echo "Push mode: full repository scan"
+            EXIT_CODE=0
+            /tmp/gitleaks detect --source . --config .gitleaks.toml --verbose --exit-code 1 || EXIT_CODE=$?
+            if [ "$EXIT_CODE" = "1" ]; then
+              echo "ERROR: Secrets detected! Check the scan report above."
+              echo "If these are false positives, add them to .gitleaks.toml allowlist."
+              exit 1
+            fi
+          fi
+          echo "gitleaks scan completed - no secrets detected"
+
       - name: Run code quality checks
         shell: sh
         run: |
@@ -110,12 +157,56 @@ jobs:
           python3 -m isort --check-only alembic apps packages tests scripts
           python3 -m flake8 apps packages tests --count --statistics
 
-      - name: Run security scan
+      - name: Run security scan (bandit)
         shell: sh
         run: |
           set -eu
           bandit -r apps packages -q -ll
 
+      - name: Python dependency vulnerability scan (pip-audit)
+        shell: sh
+        run: |
+          set -eu
+          echo "=== Installing pip-audit ==="
+          python3 -m pip install -q pip-audit
+          pip-audit --version
+          echo ""
+          echo "=== Scanning Python dependencies ==="
+          EXIT_CODE=0
+          for req_file in requirements.txt requirements-base.txt requirements-dev.txt; do
+            if [ -f "$req_file" ]; then
+              echo "--- Scanning $req_file ---"
+              pip-audit -r "$req_file" --desc on --format text 2>&1 | head -30 || EXIT_CODE=$?
+              echo ""
+            fi
+          done
+          # 告警模式，不阻断CI（待稳定后再考虑改为阻断）
+          echo "pip-audit scan completed (advisory mode - warnings only, not blocking CI)"
+          if [ "$EXIT_CODE" != "0" ]; then
+            echo "WARNING: Potential vulnerabilities found in dependencies."
+          fi
+          exit 0
+
+      - name: Dead code detection (vulture)
+        shell: sh
+        run: |
+          set -eu
+          echo "=== Installing vulture ==="
+          python3 -m pip install -q vulture
+          vulture --version
+          echo ""
+          echo "=== Running vulture dead code scan ==="
+          # 告警模式，不阻断CI（P2级别，仅供参考）
+          EXIT_CODE=0
+          vulture --config vulture.conf vulture_whitelist.py || EXIT_CODE=$?
+          echo ""
+          echo "vulture scan completed (advisory mode - P2, for reference only)"
+          if [ "$EXIT_CODE" != "0" ]; then
+            echo "NOTE: Potential dead code found. Review results above."
+            echo "False positives can be added to vulture_whitelist.py"
+          fi
+          exit 0
+
       - name: Validate release scripts syntax
         shell: sh
         run: |
diff --git a/.gitleaks.toml b/.gitleaks.toml
new file mode 100644
index 000000000..41499d6cd
--- /dev/null
+++ b/.gitleaks.toml
@@ -0,0 +1,52 @@
+# .gitleaks.toml - gitleaks 白名单配置
+# 仓库: xiaoxia/xiaoxia-saas
+# 用途: 排除已知的测试密钥、示例配置等误报
+
+# 允许路径/文件排除
+[allowlist]
+description = "全局白名单 - 排除示例配置和测试文件"
+paths = [
+    # 环境配置示例（无真实密钥）
+    '.env.example',
+    '.env.sample',
+    '*.env.example',
+    '*.env.sample',
+    # 测试文件
+    'tests/',
+    'test/',
+    '*/tests/',
+    '*/test/',
+    # 文档
+    'docs/',
+    '*.md',
+    '*.rst',
+    # 前端依赖
+    'node_modules/',
+    # Python包
+    'site-packages/',
+    # 锁定文件（自动生成）
+    'poetry.lock',
+    'Pipfile.lock',
+    'requirements*.txt.lock',
+    # CI配置本身
+    '.gitea/',
+    # Docker相关
+    'docker-compose*.yml',
+    # gitleaks配置自身
+    '.gitleaks.toml',
+]
+
+# 允许的密钥值/占位符正则
+regexes = [
+    # 占位符模式
+    '''(?i)(your[_-]?password|your[_-]?secret|your[_-]?key|your[_-]?token|changeme|change[_-]?me|placeholder|example[_-]?key|test[_-]?key|dummy|fake|mock|xxx|none|not[_-]?set|TODO|FIXME)''',
+    # 数据库连接字符串中的通用密码（PostgreSQL示例配置）
+    '''postgresql://[^:]+:changeme@''',
+    '''postgresql://[^:]+:your-password@''',
+    '''postgresql://[^:]+:password@localhost''',
+    # Redis示例配置
+    '''redis://:changeme@''',
+    '''redis://:your-redis-password@''',
+    # JWT示例密钥
+    '''(?i)jwt[_-]?secret\s*[:=]\s*["']?(your[_-]?jwt|change|placeholder|secret|example)''',
+]
diff --git a/vulture.conf b/vulture.conf
new file mode 100644
index 000000000..22ba44643
--- /dev/null
+++ b/vulture.conf
@@ -0,0 +1,35 @@
+# vulture.conf - 死代码检测配置
+# 仓库: xiaoxia/xiaoxia-saas
+# 用途: 检测未使用的函数、变量、导入、类、方法、属性
+
+# 扫描目录（空格分隔）
+path = alembic apps packages scripts
+
+# 排除路径（每个路径一行，相对于仓库根目录）
+exclude =
+    tests
+    test
+    */tests
+    */test
+    site-packages
+    node_modules
+    migrations
+    .gitea
+    docs
+    scripts/check_*.py
+    scripts/init_*.py
+
+# 最低置信度 (%)
+# 0 = 报告所有可能的未使用代码
+# 100 = 只报告确定未使用的代码
+# 推荐从 80% 开始，逐步调高
+min-confidence = 80
+
+# 输出格式: string, json, yaml
+format = text
+
+# 按置信度排序
+sort-by-size = False
+
+# 显示置信度
+show-uncertain = True
diff --git a/vulture_whitelist.py b/vulture_whitelist.py
new file mode 100644
index 000000000..155f481b7
--- /dev/null
+++ b/vulture_whitelist.py
@@ -0,0 +1,57 @@
+# vulture_whitelist.py - vulture 白名单文件
+# 用途: 列出已知被框架/动态调用的代码，避免误报
+# 参考: https://vulture.readthedocs.io/en/stable/whitelists.html
+
+# FastAPI / Starlette 框架自动调用
+# FastAPI route handlers (通过装饰器注册，vulture 可能无法识别)
+apps.*.main.*
+apps.*.api.*
+apps.*.routes.*
+apps.*.views.*
+
+# SQLAlchemy ORM
+# Model 类和字段通过 ORM 框架自动使用
+apps.*.models.*
+apps.*.schemas.*
+packages.*.models.*
+
+# Pydantic models
+# Pydantic 字段通过序列化/反序列化使用
+apps.*.schemas.*
+packages.*.schemas.*
+
+# Alembic migrations
+# Migration 函数由 alembic 自动调用
+alembic.versions.*.upgrade
+alembic.versions.*.downgrade
+
+# Celery tasks
+# Task 函数通过 celery worker 调用
+apps.*.tasks.*
+packages.*.tasks.*
+
+# CLI scripts / entry points
+# 脚本通过命令行调用
+scripts.*
+
+# 中间件
+apps.*.middleware.*
+packages.*.middleware.*
+
+# 异常类
+apps.*.exceptions.*
+packages.*.exceptions.*
+
+# 配置类
+apps.*.config.*
+packages.*.config.*
+
+# 工具函数（可能被多处间接调用，先白名单，后续清理）
+apps.*.utils.*
+packages.*.utils.*
+apps.*.helpers.*
+packages.*.helpers.*
+
+# Dependencies (FastAPI Depends)
+apps.*.dependencies.*
+packages.*.dependencies.*