feat: 服务管理支持 HTTP/HTTPS 协议选择

- Service 增加 scheme 字段，build_url 按协议拼接地址
- 表单新增协议下拉；启动时自动迁移已有 SQLite 库
- 更新部署说明中的 HTTPS 服务添加示例

Co-authored-by: Cursor <cursoragent@cursor.com>

forms.py

@@ -21,7 +21,16 @@ class GroupForm(FlaskForm):
 
 class ServiceForm(FlaskForm):
     name = StringField("服务名称", validators=[DataRequired(message="请输入服务名称")])
-    host = StringField("内网 IP 或主机名", validators=[DataRequired(message="请输入主机")])
+    scheme = SelectField(
+        "协议",
+        choices=[("http", "HTTP"), ("https", "HTTPS")],
+        default="http",
+        validators=[DataRequired(message="请选择协议")],
+    )
+    host = StringField(
+        "主机或域名",
+        validators=[DataRequired(message="请输入主机或域名")],
+    )
     port = IntegerField(
         "端口",
         validators=[