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

backend/Dockerfile

@@ -3,7 +3,7 @@ FROM node:18-alpine
 WORKDIR /app
 
 COPY package*.json ./
-RUN npm ci --production
+RUN npm install --production
 
 COPY . .
 

backend/migrations/001_create_category_tree.sql

@@ -5,7 +5,7 @@
 
 -- 1. 创建新的分类表（树状结构）
 CREATE TABLE IF NOT EXISTS category_tree (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   name TEXT NOT NULL,                      -- 分类名称
   parent_id INTEGER DEFAULT NULL,          -- 父分类ID（NULL表示一级分类）
   level INTEGER DEFAULT 1,                 -- 层级（1=一级，2=二级）
@@ -26,7 +26,7 @@ ALTER TABLE products RENAME TO products_backup;
 
 -- 创建新的商品表
 CREATE TABLE products (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   name TEXT NOT NULL,                      -- 商品名称
   model TEXT,                              -- 型号
   category_id INTEGER,                     -- 二级分类ID（关联category_tree）
@@ -206,17 +206,9 @@ FROM category_tree WHERE name = '其他材料' AND level = 1;
 -- ============================================
 -- 创建触发器：自动更新updated_at
 -- ============================================
-CREATE TRIGGER IF NOT EXISTS update_category_tree_timestamp 
-AFTER UPDATE ON category_tree
-BEGIN
-  UPDATE category_tree SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id;
-END;
 
-CREATE TRIGGER IF NOT EXISTS update_products_timestamp 
-AFTER UPDATE ON products
-BEGIN
-  UPDATE products SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id;
-END;
+
+
 
 -- ============================================
 -- 迁移完成

backend/migrations/002_create_purchase_inventory.sql

@@ -5,7 +5,7 @@
 -- 表1：采购申请表 (purchase_requests)
 -- ============================================
 CREATE TABLE IF NOT EXISTS purchase_requests (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   request_code TEXT UNIQUE NOT NULL,
   project_id INTEGER NOT NULL,
   applicant TEXT NOT NULL,
@@ -28,7 +28,7 @@ CREATE TABLE IF NOT EXISTS purchase_requests (
 -- 表2：采购明细表 (purchase_request_items)
 -- ============================================
 CREATE TABLE IF NOT EXISTS purchase_request_items (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   purchase_request_id INTEGER NOT NULL,
   product_id INTEGER,
   product_name TEXT NOT NULL,
@@ -46,7 +46,7 @@ CREATE TABLE IF NOT EXISTS purchase_request_items (
 -- 表3：库存记录表 (inventory_records)
 -- ============================================
 CREATE TABLE IF NOT EXISTS inventory_records (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   record_type TEXT NOT NULL,
   project_id INTEGER,
   purchase_request_id INTEGER,

backend/migrations/003_create_procurement_logistics_tables.sql

@@ -12,7 +12,7 @@
 -- 表1：跨境物流公司表 (logistics_companies)
 -- 设计方案章节：9.9 跨境物流公司表
 CREATE TABLE IF NOT EXISTS logistics_companies (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   code TEXT UNIQUE NOT NULL,
   name TEXT NOT NULL,
   address TEXT,
@@ -31,7 +31,7 @@ CREATE INDEX IF NOT EXISTS idx_logistics_companies_status ON logistics_companies
 -- 表2：物流公司收款信息表 (logistics_company_payment_infos)
 -- 设计方案章节：9.10 物流公司收款信息表
 CREATE TABLE IF NOT EXISTS logistics_company_payment_infos (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   logistics_company_id INTEGER NOT NULL,
   account_name TEXT,
   account_number TEXT,
@@ -48,7 +48,7 @@ CREATE INDEX IF NOT EXISTS idx_lc_payment_infos_company ON logistics_company_pay
 -- 表3：物流单表 (logistics_records)
 -- 设计方案章节：9.4 物流单表
 CREATE TABLE IF NOT EXISTS logistics_records (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   code TEXT UNIQUE NOT NULL,
   purchase_order_id INTEGER NOT NULL,
   
@@ -102,7 +102,7 @@ CREATE INDEX IF NOT EXISTS idx_logistics_records_company ON logistics_records(lo
 -- 表4：验收单表 (verification_records)
 -- 设计方案章节：9.5 验收单表
 CREATE TABLE IF NOT EXISTS verification_records (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   code TEXT UNIQUE NOT NULL,
   purchase_order_id INTEGER NOT NULL,
   logistics_record_id INTEGER,
@@ -137,7 +137,7 @@ CREATE INDEX IF NOT EXISTS idx_verification_records_status ON verification_recor
 -- 表5：退库单表 (return_records)
 -- 设计方案章节：9.6 退库单表
 CREATE TABLE IF NOT EXISTS return_records (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   code TEXT UNIQUE NOT NULL,
   project_id INTEGER NOT NULL,
   
@@ -167,7 +167,7 @@ CREATE INDEX IF NOT EXISTS idx_return_records_status ON return_records(status);
 -- 表6：材料价格历史表 (material_price_history)
 -- 设计方案章节：9.7 材料价格历史表
 CREATE TABLE IF NOT EXISTS material_price_history (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   product_id INTEGER NOT NULL,
   purchase_order_id INTEGER,
   supplier_id INTEGER,
@@ -191,7 +191,7 @@ CREATE INDEX IF NOT EXISTS idx_material_price_history_date ON material_price_his
 -- 表7：项目材料库存表 (project_material_inventory)
 -- 设计方案章节：9.8 项目材料库存表
 CREATE TABLE IF NOT EXISTS project_material_inventory (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   project_id INTEGER NOT NULL,
   product_id INTEGER NOT NULL,
   product_name TEXT,

backend/migrations/005_create_subcontractor_payment_infos.sql

@@ -1,14 +1,14 @@
 -- 创建分包商收款信息表
 CREATE TABLE IF NOT EXISTS subcontractor_payment_infos (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  id SERIAL PRIMARY KEY,
   subcontractor_id INTEGER NOT NULL,
   account_name TEXT NOT NULL,
   bank_account TEXT NOT NULL,
   bank_name TEXT NOT NULL,
   qr_code TEXT,
   is_primary INTEGER DEFAULT 0,
-  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
   FOREIGN KEY (subcontractor_id) REFERENCES subcontractors(id) ON DELETE CASCADE
 );