feat: productize ingest lifecycle and library health

backend/src/main/java/com/music/controller/HealthController.java

@@ -1,15 +1,30 @@
 package com.music.controller;
 
 import com.music.common.Result;
+import com.music.dto.DependencyStatus;
+import com.music.service.RuntimeDependencyService;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
 public class HealthController {
 
+    private final RuntimeDependencyService dependencyService;
+
+    public HealthController(RuntimeDependencyService dependencyService) {
+        this.dependencyService = dependencyService;
+    }
+
     @GetMapping("/api/health")
     public Result<String> health() {
         return Result.success("OK");
     }
-}
 
+    /**
+     * 运行时依赖检查：报告 ffmpeg / ffprobe 是否可用及版本，便于部署自检与排障。
+     */
+    @GetMapping("/api/health/dependencies")
+    public Result<DependencyStatus> dependencies() {
+        return Result.success(dependencyService.check());
+    }
+}