fix: standardize log prefixes, remove duplicates, add missing module tags

Second-pass logging cleanup: consistent [LEVEL] [module] format across
all 41 files. Remove stale prefixes ([CF], [SYNC], [SCHED], [API],
[STORAGE], [HEALTH], [ROLLBACK]). Remove 5 duplicate log lines. Gate
ungated DEBUG lines. Fix wrong log levels (restore start WARN→INFO).

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

controller/internal/metrics/collector.go

@@ -69,12 +69,12 @@ func (c *MetricsCollector) loop(ctx context.Context) {
 func (c *MetricsCollector) sampleWith(ctx context.Context) {
 	sys := c.sampleSystem()
 	if err := c.store.InsertSystemMetrics(sys); err != nil {
-		c.logger.Printf("[WARN] Failed to store system metrics: %v", err)
+		c.logger.Printf("[WARN] [metrics] Failed to store system metrics: %v", err)
 	}
 
 	containers := c.sampleContainers(ctx)
 	if err := c.store.InsertContainerMetrics(containers); err != nil {
-		c.logger.Printf("[WARN] Failed to store container metrics: %v", err)
+		c.logger.Printf("[WARN] [metrics] Failed to store container metrics: %v", err)
 	}
 }
 
@@ -104,7 +104,7 @@ func (c *MetricsCollector) sampleContainers(parentCtx context.Context) []Contain
 		"--format", "{{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}\t{{.NetIO}}\t{{.BlockIO}}")
 	out, err := cmd.Output()
 	if err != nil {
-		c.logger.Printf("[WARN] docker stats failed: %v", err)
+		c.logger.Printf("[WARN] [metrics] docker stats failed: %v", err)
 		return nil
 	}
 

controller/internal/metrics/logscanner.go

@@ -75,7 +75,7 @@ func ScanContainerLogs(containerNames []string, since time.Duration, logger *log
 	elapsed := time.Since(start)
 	dbg("log scan completed: %d containers in %s", len(containerNames), elapsed.Round(time.Millisecond))
 	if elapsed > 5*time.Minute && logger != nil {
-		logger.Printf("[WARN] Log scan took %s (>5min) for %d containers", elapsed.Round(time.Second), len(containerNames))
+		logger.Printf("[WARN] [metrics] Log scan took %s (>5min) for %d containers", elapsed.Round(time.Second), len(containerNames))
 	}
 
 	return results
@@ -92,7 +92,7 @@ func scanOneContainer(name string, since time.Duration, logger *log.Logger) Cont
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		if logger != nil {
-			logger.Printf("[DEBUG] logscanner: docker logs %s: %v", name, err)
+			logger.Printf("[DEBUG] [metrics] logscanner: docker logs %s: %v", name, err)
 		}
 		return summary
 	}

controller/internal/metrics/telemetry.go

@@ -39,7 +39,7 @@ func (s *MetricsStore) GetContainerTelemetry(since time.Time) ([]ContainerTeleme
 		var ct ContainerTelemetry
 		if err := rows.Scan(&ct.ContainerName, &ct.MemoryAvgMB, &ct.MemoryPeakMB,
 			&ct.CPUAvgPercent, &ct.SampleCount); err != nil {
-			log.Printf("[WARN] telemetry row scan failed: %v", err)
+			log.Printf("[WARN] [metrics] telemetry row scan failed: %v", err)
 			continue
 		}
 		results = append(results, ct)