refactor: framework modules log through diary components

- Each module logs through diary.For(<package>): cabana, lagoon, attach, cooler, postcard, beachcomber, lighthouse, centrifugo, flare, phrasebook, wristband, bouncer
- App-published *slog.Logger overrides stay first; messages and attributes unchanged
- sunscreen: InstallDefault documented as the compatibility entry point; diary wraps every channel
- READMEs list diary as a dependency; logging docs: plugins use diary.For

modules/lagoon/attach/bucket.go

@@ -10,11 +10,16 @@ import (
 
 	"git.golem15.com/golem15/summercms/modules/backpack"
 	"git.golem15.com/golem15/summercms/modules/compass"
+	"git.golem15.com/golem15/summercms/modules/diary"
 	"gocloud.dev/blob"
 	_ "gocloud.dev/blob/fileblob"
 	_ "gocloud.dev/blob/memblob"
 )
 
+// moduleLog is attach's logger: records carry component=attach and follow
+// log.components.attach (diary).
+var moduleLog = diary.For("attach")
+
 const defaultPublicPathPrefix = "/storage/uploads"
 
 // S3BuildTag is the Go build tag that links the gocloud S3 driver
@@ -150,7 +155,7 @@ func OpenBucket(ctx context.Context, cfg *compass.Config) (*blob.Bucket, error)
 		return bucket, nil
 	}
 	setPublicURLBase(publicURL.String())
-	slog.Default().WarnContext(ctx, "attach: storage.uploads.public_url is set; every file and thumbnail URL points at this host, "+
+	moduleLog.WarnContext(ctx, "attach: storage.uploads.public_url is set; every file and thumbnail URL points at this host, "+
 		"which serves any key without the is_public check, so the bucket behind it must hold only public files: "+
 		"protected (is_public false) uploads are refused",
 		slog.String("host", publicURL.Host))

modules/lagoon/attach/thumb.go

@@ -259,7 +259,7 @@ var BrokenImagePNG = func() []byte {
 // brokenThumb is the catch branch of WinterCMS's File::makeThumb: log the
 // reason, store BrokenImagePNG under the thumbnail key and return that key.
 func brokenThumb(ctx context.Context, bucket *blob.Bucket, f *File, thumbKey string, reason error) (string, error) {
-	slog.Default().WarnContext(ctx, "attach: thumbnail original is unusable, storing the broken-image picture",
+	moduleLog.WarnContext(ctx, "attach: thumbnail original is unusable, storing the broken-image picture",
 		slog.Uint64("file_id", uint64(f.ID)), slog.String("error", reason.Error()))
 	if err := bucket.WriteAll(ctx, thumbKey, BrokenImagePNG, &blob.WriterOptions{ContentType: "image/png"}); err != nil {
 		return "", fmt.Errorf("attach: broken-image thumb: %w", err)