✨ feat(server): 添加浏览器内 OpenAPI 调试页及诊断入口

* 新增 DebugConsoleController，提供 /debug 纯内嵌调试页
  - 零外部依赖，基于 Swagger JSON 自动生成各端点表单
  - 与 Swagger:Enabled 同步开关，避免生产环境误暴露
* 启用 <GenerateDocumentationFile>，将 XML 注释注入 OpenAPI
  - 调试页与 Swagger UI 共用同一份端点标题和说明
* 为 Health/Status/LegacyHttpApi 控制器添加 Tags 分组
* 补充 VS Code launch.json 与 tasks.json，支持现场调试
* 新增 DebugConsoleEndpointTests 覆盖调试页基础响应
* 同步更新 README 进度与待办清单

.vscode/launch.json

@@ -0,0 +1,67 @@
+{
+    // VS Code 启动与调试配置
+    // 依赖 C# 扩展（OmniSharp 或 C# Dev Kit）提供 coreclr 调试器。
+    // 文档：https://code.visualstudio.com/docs/csharp/debugger-settings
+    "version": "0.2.0",
+    "configurations": [
+        {
+            // 标准调试启动：编译并启动 Host，命中断点，浏览器自动打开首页
+            "name": ".NET Core Launch (Host)",
+            "type": "coreclr",
+            "request": "launch",
+            "program": "dotnet",
+            "args": [
+                "run",
+                "--project",
+                "${workspaceFolder}/src/Flyshot.Server.Host/Flyshot.Server.Host.csproj",
+                "--no-launch-profile"
+            ],
+            "cwd": "${workspaceFolder}",
+            "env": {
+                "ASPNETCORE_ENVIRONMENT": "Development",
+                "ASPNETCORE_URLS": "http://localhost:5190"
+            },
+            "stopAtEntry": false,
+            "console": "internalConsole",
+            "preLaunchTask": "build",
+            "serverReadyAction": {
+                "action": "openExternally",
+                "pattern": "\\bNow listening on:\\s+(https?://\\S+)",
+                "uriFormat": "%s"
+            }
+        },
+        {
+            // 热重载调试启动：自动编译、自动重启、断点保留；迭代 Web / 控制器层时首选
+            "name": ".NET Core Watch (Host)",
+            "type": "coreclr",
+            "request": "launch",
+            "program": "dotnet",
+            "args": [
+                "watch",
+                "run",
+                "--project",
+                "${workspaceFolder}/src/Flyshot.Server.Host/Flyshot.Server.Host.csproj",
+                "--no-launch-profile"
+            ],
+            "cwd": "${workspaceFolder}",
+            "env": {
+                "ASPNETCORE_ENVIRONMENT": "Development",
+                "ASPNETCORE_URLS": "http://localhost:5190"
+            },
+            "stopAtEntry": false,
+            "console": "integratedTerminal",
+            "serverReadyAction": {
+                "action": "openExternally",
+                "pattern": "\\bNow listening on:\\s+(https?://\\S+)",
+                "uriFormat": "%s"
+            }
+        },
+        {
+            // 附加到正在运行的 dotnet 进程（如已手动 `dotnet run` 或 Windows Service 模式）
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command:pickProcess}"
+        }
+    ]
+}