Dokumentenvorlagen im Ausgangsbeleg-Editor ergänzen

backend/db/migrations/0065_document_templates.sql

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+CREATE TABLE IF NOT EXISTS "documenttemplates" (
+    "id" bigint GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    "created_at" timestamptz NOT NULL DEFAULT now(),
+    "tenant" bigint NOT NULL REFERENCES "tenants"("id"),
+    "name" text NOT NULL,
+    "document_type" text NOT NULL,
+    "template_data" jsonb NOT NULL DEFAULT '{}'::jsonb,
+    "default" boolean NOT NULL DEFAULT false,
+    "archived" boolean NOT NULL DEFAULT false,
+    "updated_at" timestamptz,
+    "updated_by" uuid REFERENCES "auth_users"("id"),
+    "created_by" uuid REFERENCES "auth_users"("id")
+);
+
+CREATE INDEX IF NOT EXISTS "documenttemplates_tenant_type_idx"
+    ON "documenttemplates" ("tenant", "document_type");