feat: add FastAPI backend with PostgreSQL and start script fixes

- Add server/ directory with FastAPI backend
- Fix server/start.sh to properly handle venv on Windows/Git Bash
- Add alembic migrations and pyproject.toml
- Add server tests

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

server/src/x_financial_server.egg-info/PKG-INFO

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+Metadata-Version: 2.4
+Name: x-financial-server
+Version: 0.1.0
+Summary: Backend service for X-Financial reimbursement and approval platform.
+Requires-Python: >=3.11
+Description-Content-Type: text/markdown
+Requires-Dist: fastapi<1.0.0,>=0.115.0
+Requires-Dist: uvicorn[standard]<1.0.0,>=0.30.0
+Requires-Dist: sqlalchemy<3.0.0,>=2.0.36
+Requires-Dist: alembic<2.0.0,>=1.14.0
+Requires-Dist: psycopg[binary]<4.0.0,>=3.2.0
+Requires-Dist: pydantic-settings<3.0.0,>=2.6.0
+Requires-Dist: python-dotenv<2.0.0,>=1.0.1
+Requires-Dist: email-validator<3.0.0,>=2.2.0
+Provides-Extra: dev
+Requires-Dist: pytest<9.0.0,>=8.3.0; extra == "dev"
+Requires-Dist: httpx<1.0.0,>=0.28.0; extra == "dev"
+Requires-Dist: ruff<1.0.0,>=0.8.0; extra == "dev"
+Provides-Extra: redis
+Requires-Dist: redis<6.0.0,>=5.2.0; extra == "redis"
+
+# Server
+
+后端已按 `FastAPI + PostgreSQL + SQLAlchemy + Alembic` 起好基础工程。
+
+## 为什么先选 PostgreSQL
+
+这个项目是报销、审批、员工、流程、审计记录为主，核心特点是：
+
+- 强事务
+- 多表关联明显
+- 审批流和审计日志需要一致性
+- 后续大概率要做复杂查询、统计和条件筛选
+
+这类系统优先选关系型数据库更合适，`PostgreSQL` 是当前默认推荐。
+
+## Redis 要不要现在上
+
+现在 **不是必须**。
+
+先不把 Redis 作为启动前置，原因很直接：
+
+- 当前第一阶段先把核心业务表、接口、权限、审批流跑通
+- 如果一开始就把 Redis 绑死，会增加部署和排障复杂度
+
+Redis 更适合后面这些场景：
+
+- 登录态 / token 黑名单
+- 热点数据缓存
+- 限流
+- 分布式锁
+- 消息队列 / 后台任务
+
+所以现在的策略是：
+
+- 主数据库：`PostgreSQL`
+- Redis：`可选能力`，配置已预留，但不是必需依赖
+
+## 目录
+
+- `src/app/`：应用代码
+- `alembic/`：数据库迁移
+- `tests/`：测试
+
+## 启动
+
+1. 创建虚拟环境并安装依赖
+
+```bash
+cd server
+python -m venv .venv
+.venv\\Scripts\\activate
+pip install -e .[dev]
+```
+
+2. 在项目根目录准备环境变量
+
+```bash
+copy ..\\.env.example ..\\.env
+```
+
+3. 启动服务
+
+```bash
+uvicorn app.main:app --reload --app-dir src
+```
+
+## 迁移
+
+```bash
+alembic upgrade head
+```

server/src/x_financial_server.egg-info/SOURCES.txt

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+README.md
+pyproject.toml
+src/app/__init__.py
+src/app/main.py
+src/app/api/__init__.py
+src/app/api/deps.py
+src/app/api/router.py
+src/app/api/v1/__init__.py
+src/app/api/v1/router.py
+src/app/api/v1/endpoints/__init__.py
+src/app/api/v1/endpoints/bootstrap.py
+src/app/api/v1/endpoints/employees.py
+src/app/api/v1/endpoints/health.py
+src/app/api/v1/endpoints/reimbursements.py
+src/app/core/__init__.py
+src/app/core/bootstrap.py
+src/app/core/config.py
+src/app/db/__init__.py
+src/app/db/base.py
+src/app/db/base_class.py
+src/app/db/session.py
+src/app/models/__init__.py
+src/app/models/approval.py
+src/app/models/employee.py
+src/app/models/reimbursement.py
+src/app/repositories/__init__.py
+src/app/repositories/employee.py
+src/app/repositories/reimbursement.py
+src/app/schemas/__init__.py
+src/app/schemas/bootstrap.py
+src/app/schemas/employee.py
+src/app/schemas/reimbursement.py
+src/app/services/__init__.py
+src/app/services/employee.py
+src/app/services/reimbursement.py
+src/x_financial_server.egg-info/PKG-INFO
+src/x_financial_server.egg-info/SOURCES.txt
+src/x_financial_server.egg-info/dependency_links.txt
+src/x_financial_server.egg-info/requires.txt
+src/x_financial_server.egg-info/top_level.txt
+tests/test_imports.py

server/src/x_financial_server.egg-info/dependency_links.txt

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+

server/src/x_financial_server.egg-info/requires.txt

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+fastapi<1.0.0,>=0.115.0
+uvicorn[standard]<1.0.0,>=0.30.0
+sqlalchemy<3.0.0,>=2.0.36
+alembic<2.0.0,>=1.14.0
+psycopg[binary]<4.0.0,>=3.2.0
+pydantic-settings<3.0.0,>=2.6.0
+python-dotenv<2.0.0,>=1.0.1
+email-validator<3.0.0,>=2.2.0
+
+[dev]
+pytest<9.0.0,>=8.3.0
+httpx<1.0.0,>=0.28.0
+ruff<1.0.0,>=0.8.0
+
+[redis]
+redis<6.0.0,>=5.2.0

server/src/x_financial_server.egg-info/top_level.txt

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+app