调整 .gitignore 以适配 backends 目录结构

将 MiGu.Server 相关忽略规则迁移至 backends/MiGu.Server，并新增对 .tmp-build* 和 /.cursor/rules 的忽略，优化敏感数据与临时文件的管理。

MiGu.Server/Controllers/ProjectionController.cs

@@ -1,45 +0,0 @@
-using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Mvc;
-
-namespace MiGu.Server.Controllers;
-
-/// <summary>
-/// 投影 API 占位：真实落地时由 YARP 反代到 SimpleLite WebAPI 的 /api/projection/* 路径。
-/// 本地 Mock 数据仅用于无 SimpleLite 运行时的开发联调。
-///
-/// AR-4: 全 class 加 [Authorize] —— 任何登录用户都能读 mock 投影数据；未登录直接 401。
-/// </summary>
-[ApiController]
-[Authorize]
-[Route("api/projection")]
-public class ProjectionController : ControllerBase
-{
-    [HttpGet("sites")]
-    public IActionResult Sites() => Ok(new[]
-    {
-        new { id = "S001", name = "A 区-入库点", x = 1000, y = 2000 },
-        new { id = "S002", name = "A 区-出库点", x = 3000, y = 2000 },
-        new { id = "S003", name = "B 区-缓存区", x = 5000, y = 2000 }
-    });
-
-    [HttpGet("tracks")]
-    public IActionResult Tracks() => Ok(new[]
-    {
-        new { id = "T001", kind = "line", fromSiteId = "S001", toSiteId = "S002" },
-        new { id = "T002", kind = "line", fromSiteId = "S002", toSiteId = "S003" }
-    });
-
-    [HttpGet("cars")]
-    public IActionResult Cars() => Ok(new[]
-    {
-        new { id = "C01", name = "AGV-001", state = "running", batterySoc = 0.86 },
-        new { id = "C02", name = "AGV-002", state = "idle", batterySoc = 0.42 }
-    });
-
-    [HttpGet("missions")]
-    public IActionResult Missions() => Ok(new[]
-    {
-        new { id = "M01", name = "A 区送料 #1", status = "running", priority = 50 },
-        new { id = "M02", name = "A→B 缓存搬运", status = "queued", priority = 60 }
-    });
-}