feat: 初始化SecScore项目基础结构

- 添加Electron + React + TypeScript基础框架
- 实现学生管理、积分流水、理由管理功能
- 添加主题切换和暗黑模式支持
- 配置数据库和WebSocket同步功能
- 完善项目文档和构建配置

src/main/repos/StudentRepository.ts

@@ -0,0 +1,43 @@
+import { Database } from 'better-sqlite3';
+
+export interface Student {
+  id: number;
+  name: string;
+  score: number;
+  extra_json?: string;
+}
+
+export class StudentRepository {
+  constructor(private db: Database) {}
+
+  findAll() {
+    return this.db.prepare('SELECT * FROM students ORDER BY score DESC, name ASC').all() as Student[];
+  }
+
+  create(student: { name: string }) {
+    const info = this.db.prepare(
+      'INSERT INTO students (name) VALUES (?)'
+    ).run(student.name);
+    return info.lastInsertRowid as number;
+  }
+
+  update(id: number, student: Partial<Student>) {
+    const sets: string[] = [];
+    const vals: any[] = [];
+    Object.entries(student).forEach(([key, val]) => {
+      if (key !== 'id') {
+        sets.push(`${key} = ?`);
+        vals.push(val);
+      }
+    });
+    vals.push(id);
+    this.db.prepare(`UPDATE students SET ${sets.join(', ')}, updated_at = CURRENT_TIMESTAMP WHERE id = ?`).run(...vals);
+  }
+
+  delete(id: number) {
+    this.db.transaction(() => {
+      this.db.prepare('DELETE FROM score_events WHERE student_id = ?').run(id);
+      this.db.prepare('DELETE FROM students WHERE id = ?').run(id);
+    })();
+  }
+}