docs: 生成项目文档并优化项目结构

- 生成完整的 README.md 项目文档
- 统一图片路径为相对引用
- 完善 .gitignore 配置，添加常见忽略项
- 清理未使用的临时文件和图片资源
- 删除废弃的脚本文件

scripts/init_sample_data.sql

@@ -0,0 +1,58 @@
+SET client_encoding = 'UTF8';
+
+CREATE TABLE IF NOT EXISTS users (
+  id SERIAL PRIMARY KEY,
+  username VARCHAR(255) UNIQUE,
+  name VARCHAR(255),
+  email VARCHAR(255),
+  phone VARCHAR(255),
+  role VARCHAR(50),
+  password_hash VARCHAR(255),
+  created_at TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS customers (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(255),
+  address VARCHAR(255),
+  remark TEXT,
+  contact_person VARCHAR(255),
+  phone VARCHAR(255),
+  email VARCHAR(255),
+  created_at TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS projects (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(255),
+  project_code VARCHAR(255),
+  customer_id INTEGER,
+  project_manager_id INTEGER,
+  contract_amount NUMERIC,
+  status VARCHAR(50),
+  location VARCHAR(255),
+  created_at TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+-- 1. 插入用户数据
+INSERT INTO users (username, name, email, phone, role, password_hash, created_at, updated_at) VALUES 
+('admin', '系统管理员', 'admin@yunhai.com', '13800000001', 'admin', '$2a$10$xyz', NOW(), NOW()),
+('finance', '财务专员', 'finance@yunhai.com', '13800000002', 'finance', '$2a$10$xyz', NOW(), NOW()),
+('manager', '项目经理', 'manager@yunhai.com', '13800000003', 'manager', '$2a$10$xyz', NOW(), NOW()),
+('employee', '普通员工', 'employee@yunhai.com', '13800000004', 'employee', '$2a$10$xyz', NOW(), NOW())
+ON CONFLICT (username) DO NOTHING;
+
+-- 2. 插入客户数据
+INSERT INTO customers (name, address, remark, contact_person, phone, email, created_at, updated_at) VALUES
+('老挝国家电力公司', '万象市', '大客户', 'Somphong', '020-11111111', 'edl@laos.com', NOW(), NOW()),
+('万象基建集团', '万象市', '长期合作', 'Champa', '020-22222222', 'infra@laos.com', NOW(), NOW()),
+('琅勃拉邦电力局', '琅勃拉邦', '', 'Keo', '020-33333333', 'lpq@laos.com', NOW(), NOW());
+
+-- 3. 插入项目数据 (假设customer_id与上表对应)
+INSERT INTO projects (name, project_code, customer_id, project_manager_id, contract_amount, status, location, created_at, updated_at) VALUES
+('万象22kV线路工程', 'P2026-001', 1, 3, 1500000, 'in_progress', '万象市赛塔尼县', NOW(), NOW()),
+('琅勃拉邦变电站改造', 'P2026-002', 3, 3, 800000, 'planning', '琅勃拉邦', NOW(), NOW()),
+('南塔电力抢修', 'P2026-003', 1, 3, 300000, 'completed', '南塔省', NOW(), NOW());