admin: submissions page, download endpoint, uploads search by app_id

Co-Authored-By: Claude <noreply@anthropic.com>

main.go

@@ -105,7 +105,7 @@ func run() error {
 		c.JSON(http.StatusOK, gin.H{"ok": true, "version": "0.0.0"})
 	})
 
-	admin.Mount(r, db.Clusters(), db.Uploads(), audit.NewRepo(db), &uploadStore, cfg.AdminTokens)
+	admin.Mount(r, db.Clusters(), db.Uploads(), db.Submissions(), audit.NewRepo(db), &uploadStore, cfg.AdminTokens)
 
 	mcpHandler, err := mcpsrv.Handler(&tools.Deps{
 		Logger:             logger.With("component", "mcp"),
@@ -119,6 +119,7 @@ func run() error {
 		MaxResponseBytes: cfg.MaxResponseBytes,
 		DataDir:          cfg.DataDir,
 		UploadStore:      uploadStore,
+		SubmissionRepo:   db.Submissions(),
 		AnalyzerThresholds: analyzer.Thresholds{
 			DataSkewRatio:       cfg.AnalyzerDataSkewRatio,
 			GCPressureRatio:     cfg.AnalyzerGCPressureRatio,