feat: comprehensive INFO/WARN/ERROR logging across all controller modules

Add structured operational logging at INFO, WARN, and ERROR levels to
every controller module. Standardize custom prefixes ([GEO], [SCHED],
[SYNC]) to use [INFO/WARN/ERROR] [module] format. Fix misleveled logs
(WARN->ERROR for data loss scenarios, WARN->INFO for routine operations).

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

controller/internal/backup/dbdump.go

@@ -135,6 +135,7 @@ func DiscoverDatabases(ctx context.Context, logger *log.Logger, debug bool) ([]D
 		logger.Printf("[DEBUG] DiscoverDatabases: found %d database(s), skipped %d non-DB container(s)", len(dbs), skipped)
 	}
 
+	logger.Printf("[INFO] [backup] Discovered %d databases", len(dbs))
 	return dbs, nil
 }
 
@@ -143,11 +144,17 @@ func DumpAll(ctx context.Context, dbs []DiscoveredDB, dumpDir string, logger *lo
 	// Clean up old .tmp files (older than 1 hour)
 	cleanupTmpFiles(dumpDir, logger)
 
+	logger.Printf("[INFO] [backup] Starting DB dump for %d databases", len(dbs))
 	var results []DumpResult
+	var failed int
 	for _, db := range dbs {
 		result := DumpOne(ctx, db, dumpDir, logger, debug)
 		results = append(results, result)
+		if result.Error != nil {
+			failed++
+		}
 	}
+	logger.Printf("[INFO] [backup] DB dump complete: %d succeeded, %d failed", len(results)-failed, failed)
 	return results
 }