Add migration to clean up plugin settings from main settings table

Remove any dot-namespaced keys (e.g. analytics.enabled) from the
settings table that were seeded before plugin settings moved to
their own plugin_settings table.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: compscidr

tools/migrate.go

@@ -379,10 +379,24 @@ func Migrate(db *gorm.DB) error {
 	seedDefaultPages(db)
 	linkWritingPagesToPostType(db)
 	cleanupEmptyTags(db)
+	cleanupPluginSettingsFromMainTable(db)
 
 	return nil
 }
 
+// cleanupPluginSettingsFromMainTable removes any dot-namespaced keys
+// from the main settings table that belong in plugin_settings instead.
+func cleanupPluginSettingsFromMainTable(db *gorm.DB) {
+	result := db.Exec("DELETE FROM settings WHERE key LIKE '%.%'")
+	if result.Error != nil {
+		log.Printf("Warning: failed to clean up plugin settings from main table: %v", result.Error)
+		return
+	}
+	if result.RowsAffected > 0 {
+		log.Printf("Cleaned up %d plugin settings from main settings table", result.RowsAffected)
+	}
+}
+
 // cleanupEmptyTags removes empty-name tag associations and the empty tag itself.
 func cleanupEmptyTags(db *gorm.DB) {
 	result := db.Exec("DELETE FROM post_tags WHERE tag_name = ''")