refactor: 模块化架构重构 & 完善测试与文档体系

- 架构重构：拆分为 routes/services/repositories/security 分层结构
- 新增测试：添加完整的单元测试套件（烟雾测试/核心功能/错误处理等）
- 完善文档：添加开发者指南、运行验证、回归清单、性能基线等文档
- 前后端分离：静态资源独立，模板组件化
- CI/CD：添加 GitHub Actions 自动化测试
- Docker 优化：添加健康检查，修复调度器启动问题
- 配置增强：支持 SCHEDULER_AUTOSTART 环境变量

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

.github/workflows/python-tests.yml

@@ -0,0 +1,48 @@
+name: Python Tests
+
+on:
+  push:
+    branches: [ "main", "master" ]
+    paths:
+      - "**.py"
+      - "requirements.txt"
+      - "tests/**"
+      - ".github/workflows/python-tests.yml"
+  pull_request:
+    paths:
+      - "**.py"
+      - "requirements.txt"
+      - "tests/**"
+      - ".github/workflows/python-tests.yml"
+  workflow_dispatch:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [ "3.11", "3.12", "3.13" ]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements.txt
+
+      - name: Syntax check
+        run: |
+          python -m py_compile web_outlook_app.py
+          python -m py_compile outlook_mail_reader.py
+
+      - name: Run unit tests
+        run: python -m unittest discover -s tests -v
+