feat(telemetry): add per-app metrics and log telemetry to hub reports (v0.28.0)

- New internal/metrics/telemetry.go: MetricsStore.GetContainerTelemetry()
  aggregates container memory/CPU from SQLite over the last 15 min
- New internal/metrics/logscanner.go: ScanContainerLogs() scans docker logs
  for errors/warnings, deduplicates via fingerprinting (strips timestamps,
  replaces 6+ digit numbers, hex strings, UUIDs)
- New internal/report/telemetry.go: buildAppTelemetrySection() assembles
  per-stack AppTelemetry by aggregating container metrics and log summaries
- internal/report/types.go: added AppTelemetry field to Report struct plus
  AppTelemetry type with memory/CPU/log fields and LogIssue references
- internal/report/builder.go: calls buildAppTelemetrySection() in BuildReport()
- Backward-compatible: old Hub versions silently ignore app_telemetry field

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

controller/internal/report/builder.go

@@ -150,9 +150,12 @@ func BuildReport(
 	// Stacks
 	r.Stacks = buildStacksReport(stackMgr)
 
+	// App telemetry (metrics + log scan)
+	r.AppTelemetry = buildAppTelemetrySection(stackMgr, metricsStore, logger)
+
 	if debug && logger != nil {
-		logger.Printf("[DEBUG] BuildReport: complete — containers=%d, health=%s, deployed=%d, available=%d",
-			r.Containers.Total, r.Health.Status, len(r.Stacks.Deployed), len(r.Stacks.Available))
+		logger.Printf("[DEBUG] BuildReport: complete — containers=%d, health=%s, deployed=%d, available=%d, app_telemetry=%d",
+			r.Containers.Total, r.Health.Status, len(r.Stacks.Deployed), len(r.Stacks.Available), len(r.AppTelemetry))
 	}
 
 	return r