feat(03-01): initialize fonoteka workspace with user and genre migrations

Add compiled golem15.user and golem15.fonoteka plugins, squash schema
to the genre slice tables, and seed the 15 canonical genres on ICU pl-PL.

Co-authored-by: Cursor <cursoragent@cursor.com>

plugin.go

@@ -0,0 +1,37 @@
+package user
+
+import (
+	"embed"
+	"io/fs"
+
+	"git.golem15.com/golem15/summercms/backpack"
+	"git.golem15.com/golem15/summercms/pact"
+	"git.golem15.com/golem15/summercms/party"
+	"github.com/go-gormigrate/gormigrate/v2"
+)
+
+var (
+	_ party.Plugin       = (*Plugin)(nil)
+	_ pact.HasConfig     = (*Plugin)(nil)
+	_ pact.HasMigrations = (*Plugin)(nil)
+)
+
+//go:embed config
+var configFS embed.FS
+
+// Plugin is the stub golem15.user plugin.
+type Plugin struct{}
+
+func (p *Plugin) ID() string         { return "golem15.user" }
+func (p *Plugin) Requires() []string { return nil }
+
+func (p *Plugin) Register(*backpack.App) error { return nil }
+func (p *Plugin) Boot(*backpack.App) error     { return nil }
+
+func (p *Plugin) ConfigFS() fs.FS { return configFS }
+
+func (p *Plugin) Migrations() []*gormigrate.Migration { return migrations }
+
+func init() {
+	party.Register(&Plugin{})
+}