chore: 准备开源发布 - 只保留源代码

移除所有非源代码文件：
- 删除 docs/ 目录（所有内部文档）
- 删除 tests/ 目录（所有测试文件）
- 删除 .github/ 目录（CI/CD 配置）
- 删除 .kiro/ 目录（IDE 配置）
- 删除 CONTRIBUTING.md, SECURITY.md

更新项目文件：
- 重写 README.md，简洁清晰（从 1600+ 行压缩到 237 行）
- 更新 .gitignore，忽略所有非源代码文件
- 使用 ASCII art 展示界面布局
- 添加 Shields.io 徽章美化项目

保留的文件：
- 源代码：outlook_web/, static/, templates/
- 入口文件：web_outlook_app.py, start.py, outlook_mail_reader.py
- 配置文件：requirements.txt, Dockerfile, .dockerignore, .env.example
- 项目文档：README.md, LICENSE, .gitignore

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

.github/workflows/python-tests.yml

@@ -1,48 +0,0 @@
-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
-