Merge branch 'feature/iam-03-passwort-reset-einladungs-flow' into feature/qa-02-pruefgate-identitaet-mandanten

# Conflicts:
#	scripts/reset-test-env.sh
#	scripts/run-checks.sh

migrations/tenant/0003_password_tokens.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS password_tokens;

migrations/tenant/0003_password_tokens.up.sql

@@ -0,0 +1,12 @@
+-- Einmal-Token fuer Passwort-Reset und Einladung (IAM-03, siehe
+-- core-kanban/tickets/IAM-03.md). token_hash enthaelt NIEMALS den
+-- Klartext-Token, nur dessen SHA-256-Hash.
+CREATE TABLE password_tokens (
+    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id    UUID NOT NULL REFERENCES users(id),
+    token_hash BYTEA NOT NULL UNIQUE,
+    purpose    TEXT NOT NULL CHECK (purpose IN ('reset', 'invite')),
+    expires_at TIMESTAMPTZ NOT NULL,
+    used_at    TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);