backend v2.1: 公告管理功能 + 系统重构

- 新增 Announcement 数据模型，支持公告的增删改查
- 后台管理新增"公告管理"Tab（创建/编辑/删除/启用禁用）
- 客户端 /api/announcement 改为从数据库读取
- 账号服务重构，新增无感换号、自动分析等功能
- 新增后台任务调度器、数据库迁移脚本
- Schema/Service/Config 全面升级至 v2.1

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

backend/run_migration.py

@@ -0,0 +1,69 @@
+"""
+数据库迁移脚本
+执行: python run_migration.py
+"""
+import os
+import sys
+
+# 添加项目路径
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+from sqlalchemy import text
+from app.database import engine, Base
+from app.models.models import CursorAccount, ActivationKey, KeyDevice, UsageLog, GlobalSettings
+
+def run_migration():
+    """执行数据库迁移"""
+    print("=" * 50)
+    print("蜂鸟Pro v2.1 数据库迁移")
+    print("=" * 50)
+
+    # 方式1: 使用 SQLAlchemy 自动创建/更新表结构
+    print("\n[1/3] 创建/更新表结构...")
+    try:
+        Base.metadata.create_all(bind=engine)
+        print("✓ 表结构更新完成")
+    except Exception as e:
+        print(f"✗ 表结构更新失败: {e}")
+        return False
+
+    # 方式2: 执行自定义迁移 SQL
+    print("\n[2/3] 执行数据迁移...")
+    migration_sqls = [
+        # 更新旧的状态值
+        "UPDATE cursor_accounts SET status = 'available' WHERE status = 'active'",
+        "UPDATE cursor_accounts SET status = 'exhausted' WHERE status = 'expired'",
+        # 更新旧的套餐类型
+        "UPDATE activation_keys SET membership_type = 'auto' WHERE membership_type = 'free'",
+    ]
+
+    with engine.connect() as conn:
+        for sql in migration_sqls:
+            try:
+                conn.execute(text(sql))
+                conn.commit()
+                print(f"✓ {sql[:50]}...")
+            except Exception as e:
+                # 忽略不存在的列/值错误
+                if "Unknown column" not in str(e) and "Data truncated" not in str(e):
+                    print(f"⚠ 跳过: {e}")
+
+    # 方式3: 初始化默认设置
+    print("\n[3/3] 初始化全局设置...")
+    try:
+        from sqlalchemy.orm import Session
+        with Session(engine) as db:
+            from app.services import GlobalSettingsService
+            GlobalSettingsService.init_settings(db)
+            print("✓ 全局设置初始化完成")
+    except Exception as e:
+        print(f"⚠ 设置初始化: {e}")
+
+    print("\n" + "=" * 50)
+    print("迁移完成!")
+    print("=" * 50)
+    print("\n现在可以启动后端: uvicorn app.main:app --reload")
+    return True
+
+if __name__ == "__main__":
+    run_migration()