added go-migrate Migrations

migrations/20250802075213_control_tables.down.sql

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+-- reverse rename "s_personal_daten" table
+ALTER TABLE "s_personal_daten" RENAME TO "personal_daten";
+
+DROP TABLE "s_personal_daten";
+-- reverse: create "s_anwesenheit_typen" table
+DROP TABLE "s_anwesenheit_typen";
+-- reverse: create "s_abwesenheit_typen" table
+DROP TABLE "s_abwesenheit_typen";
+-- reverse: modify "anwesenheit" table
+ALTER TABLE "anwesenheit" DROP COLUMN "manuelle_buchung";