feat: add admin UI frontend and complete backend APIs

- Add Vue 3 frontend with Element Plus
- Implement login, dashboard, tenant management
- Add app configuration, logs viewer, stats pages
- Add user management for admins
- Update Drone CI to build and deploy frontend
- Frontend ports: 3001 (test), 4001 (prod)

backend/app/models/tenant_app.py

@@ -0,0 +1,31 @@
+"""租户应用配置模型"""
+from datetime import datetime
+from sqlalchemy import Column, BigInteger, Integer, String, Text, SmallInteger, TIMESTAMP
+from ..database import Base
+
+
+class TenantApp(Base):
+    """租户应用配置表"""
+    __tablename__ = "platform_tenant_apps"
+    
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    tenant_id = Column(String(50), nullable=False)
+    app_code = Column(String(50), nullable=False, default='tools')
+    app_name = Column(String(100))
+    
+    # 企业微信配置
+    wechat_corp_id = Column(String(100))
+    wechat_agent_id = Column(String(50))
+    wechat_secret_encrypted = Column(Text)
+    
+    # 鉴权配置
+    token_secret = Column(String(64))
+    token_required = Column(SmallInteger, default=0)
+    allowed_origins = Column(Text)  # JSON 数组
+    
+    # 功能权限
+    allowed_tools = Column(Text)  # JSON 数组
+    
+    status = Column(SmallInteger, default=1)
+    created_at = Column(TIMESTAMP, default=datetime.now)
+    updated_at = Column(TIMESTAMP, default=datetime.now, onupdate=datetime.now)

backend/app/models/user.py

@@ -0,0 +1,19 @@
+"""用户模型"""
+from datetime import datetime
+from sqlalchemy import Column, BigInteger, String, Enum, TIMESTAMP, SmallInteger
+from ..database import Base
+
+
+class User(Base):
+    """用户表"""
+    __tablename__ = "platform_users"
+    
+    id = Column(BigInteger, primary_key=True, autoincrement=True)
+    username = Column(String(50), unique=True, nullable=False)
+    password_hash = Column(String(255), nullable=False)
+    nickname = Column(String(100))
+    role = Column(Enum('admin', 'operator', 'viewer'), default='viewer')
+    status = Column(SmallInteger, default=1)  # 1=启用, 0=禁用
+    last_login_at = Column(TIMESTAMP, nullable=True)
+    created_at = Column(TIMESTAMP, default=datetime.now)
+    updated_at = Column(TIMESTAMP, default=datetime.now, onupdate=datetime.now)