Initial commit: lottery project structure

Add core project files including:
- Client and server directories
- Backup script
- Package configuration
- Git ignore rules

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

server/db/init.js

@@ -0,0 +1,44 @@
+const Database = require('better-sqlite3');
+const path = require('path');
+
+const db = new Database(path.join(__dirname, 'lottery.db'));
+
+// 初始化表结构
+db.exec(`
+  CREATE TABLE IF NOT EXISTS users (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    username TEXT UNIQUE NOT NULL,
+    password TEXT NOT NULL,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+  );
+
+  CREATE TABLE IF NOT EXISTS tickets (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id INTEGER NOT NULL,
+    type TEXT NOT NULL,
+    game TEXT NOT NULL,
+    issue TEXT,
+    numbers TEXT,
+    bet_count INTEGER DEFAULT 1,
+    multiple INTEGER DEFAULT 1,
+    is_additional INTEGER DEFAULT 0,
+    cost REAL NOT NULL,
+    prize REAL DEFAULT 0,
+    status TEXT DEFAULT 'pending',
+    image_path TEXT,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (user_id) REFERENCES users(id)
+  );
+
+  CREATE TABLE IF NOT EXISTS lottery_results (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    game TEXT NOT NULL,
+    issue TEXT NOT NULL,
+    numbers TEXT NOT NULL,
+    draw_date DATE,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(game, issue)
+  );
+`);
+
+module.exports = db;