feat(msp): Beleg-Titel pro Profil per Template einstellbar

Bisher wurde der Titel hart als '{title_prefix} {period}' gebaut.
Jetzt zwei optionale Felder im Supplier Import Profile:

- title_template            (für Rechnungen / Lieferscheine)
- title_template_credit_note (für Gutschriften)

Verfügbare Platzhalter:
  {prefix}        — bisheriges title_prefix / title_prefix_credit_note
  {period}        — z. B. "09.2025" oder "09.2025 – 03.2026"
  {customer}      — Customer-Ref (CUST-…)
  {customer_name} — Anzeigename des Kunden
  {vendor}        — Vendor-Feld des Profils (z. B. "Microsoft")
  {posting_date}  — DD.MM.YYYY
  {document_type} — "Sales Invoice" / "Delivery Note"

Backwards-compatible: leeres Template fällt auf das alte Verhalten
zurück. Unbekannte Platzhalter werden geloggt und der Builder fällt
ebenfalls auf {prefix} {period} zurück, statt einen Run zu kippen.

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

msp/fixtures/supplier_import_profile.json

@@ -22,6 +22,8 @@
   "supplier": "SUPP-00887",
   "title_prefix": "Abrechnung Microsoft Abo ",
   "title_prefix_credit_note": "Gutschrift Microsoft Abo ",
+  "title_template": "{prefix} {period}",
+  "title_template_credit_note": "{prefix} {period}",
   "vendor": "Microsoft"
  }
 ]

msp/importers/builder.py

@@ -113,16 +113,15 @@ class DocumentBuilder:
 		"""Erzeugt das Grundgerüst (ohne Zeilen) der Sales Invoice / Delivery Note."""
 		profile = self.profile
 		period = self._format_period_label(first)
-		title_prefix = profile.title_prefix_credit_note if is_return else profile.title_prefix
-		title = f"{(title_prefix or '').strip()} {period}".strip()
+		posting_date = self._coerce_german_date(first.raw.get("DATUM") or frappe.utils.today())
+		title = self._render_title(customer, period, posting_date, is_return=is_return)
 
 		if self.output_mode == "Sales Invoice":
 			doc = frappe.new_doc("Sales Invoice")
 			doc.customer = customer
 			doc.company = profile.default_company
 			doc.currency = frappe.db.get_value("Company", profile.default_company, "default_currency") or "EUR"
-			doc.posting_date = first.raw.get("DATUM") or frappe.utils.today()
-			doc.posting_date = self._coerce_german_date(doc.posting_date)
+			doc.posting_date = posting_date
 			doc.set_posting_time = 1
 			if profile.default_cost_center:
 				doc.cost_center = profile.default_cost_center
@@ -147,7 +146,7 @@ class DocumentBuilder:
 		doc = frappe.new_doc("Delivery Note")
 		doc.customer = customer
 		doc.company = profile.default_company
-		doc.posting_date = self._coerce_german_date(first.raw.get("DATUM") or frappe.utils.today())
+		doc.posting_date = posting_date
 		doc.set_posting_time = 1
 		if profile.default_cost_center:
 			doc.cost_center = profile.default_cost_center
@@ -312,6 +311,42 @@ class DocumentBuilder:
 			return invdate.strftime("%m.%Y")
 		return _d.today().strftime("%m.%Y")
 
+	def _render_title(self, customer: str, period: str, posting_date, *, is_return: bool) -> str:
+		"""Rendert den Beleg-Titel aus dem konfigurierten Template (mit Fallback).
+
+		Platzhalter: {prefix}, {period}, {customer}, {customer_name},
+		{vendor}, {posting_date}, {document_type}.
+		"""
+		profile = self.profile
+		template = (profile.title_template_credit_note if is_return else profile.title_template) or ""
+		prefix = (profile.title_prefix_credit_note if is_return else profile.title_prefix) or ""
+		template = template.strip()
+		if not template:
+			# Backwards-compat: bisheriges Verhalten "{prefix} {period}".
+			return f"{prefix.strip()} {period}".strip()
+
+		customer_name = frappe.db.get_value("Customer", customer, "customer_name") or customer
+		try:
+			rendered = template.format(
+				prefix=prefix.strip(),
+				period=period,
+				customer=customer,
+				customer_name=customer_name,
+				vendor=profile.vendor or "",
+				posting_date=posting_date.strftime("%d.%m.%Y") if hasattr(posting_date, "strftime") else str(posting_date),
+				document_type=self.output_mode or "",
+			)
+		except (KeyError, IndexError) as e:
+			# Unbekannter Platzhalter — robust auf Fallback zurückfallen, aber dem Run
+			# trotzdem einen Hinweis mitgeben, indem wir den Profilfehler in die Logs schreiben.
+			frappe.log_error(
+				f"Title-Template enthält ungültigen Platzhalter ({e}); fällt auf '{{prefix}} {{period}}' zurück.",
+				"Supplier Import Builder",
+			)
+			rendered = f"{prefix.strip()} {period}".strip()
+		# Mehrfach-Whitespace zusammenfassen
+		return " ".join(rendered.split())
+
 	@staticmethod
 	def _copy_tax_template_rows(doc, template_name: str) -> None:
 		"""Kopiert die Zeilen des Sales-Taxes-and-Charges-Templates explizit in doc.taxes.

msp/msp/doctype/supplier_import_profile/supplier_import_profile.json

@@ -29,6 +29,8 @@
   "text_section",
   "title_prefix",
   "title_prefix_credit_note",
+  "title_template",
+  "title_template_credit_note",
   "intro_text_invoice",
   "intro_text_credit_note",
   "fallback_section",
@@ -170,6 +172,18 @@
    "fieldtype": "Data",
    "label": "Title Prefix (Credit Note)"
   },
+  {
+   "fieldname": "title_template",
+   "fieldtype": "Data",
+   "label": "Title Template (Invoice)",
+   "description": "Optionales Format-String für den Beleg-Titel. Platzhalter: {prefix}, {period}, {customer}, {customer_name}, {vendor}, {posting_date}, {document_type}. Leer = '{prefix} {period}'."
+  },
+  {
+   "fieldname": "title_template_credit_note",
+   "fieldtype": "Data",
+   "label": "Title Template (Credit Note)",
+   "description": "Wie 'Title Template (Invoice)', nur für Gutschriften. Leer = '{prefix} {period}'."
+  },
   {
    "fieldname": "intro_text_invoice",
    "fieldtype": "Text Editor",