feat: konfigurierbarer Dateiname + Archiv-Modus für Original (v0.3.0)

Neue [output]-Section:
- name_mode: prefix | suffix | none (suffix wird vor Extension eingefügt)
- name_tag: verbatim einfügbarer String
- original_on_success: delete | archive
- archive_dir mit Kollisions-Schutz (Timestamp-Suffix)

20 neue Tests (50 insgesamt, alle grün).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pdf_ocr_hotfolder/service.py

@@ -72,6 +72,20 @@ def detect_ghostscript_version() -> str | None:
     return result.stdout.strip() or None
 
 
+def check_output_config(mode: str, archive_dir: str) -> None:
+    """Validiert die [output]-Section. Wirft PreflightError bei Problemen."""
+    valid_modes = {"delete", "archive"}
+    if mode not in valid_modes:
+        raise PreflightError(
+            f"[output].original_on_success={mode!r} ungültig. "
+            f"Erlaubt: {sorted(valid_modes)}"
+        )
+    if mode == "archive" and not archive_dir:
+        raise PreflightError(
+            "[output].original_on_success='archive' erfordert [output].archive_dir"
+        )
+
+
 def check_preflight(pdfa_level: str = "") -> None:
     """Prüft externe Abhängigkeiten.
 
@@ -173,6 +187,8 @@ class HotfolderService:
 
     def run(self) -> None:
         check_preflight(self.cfg.ocr.pdfa_level)
+        check_output_config(self.cfg.output.original_on_success,
+                            self.cfg.output.archive_dir)
         self.ensure_dirs()
         self._scan_existing()
 
@@ -197,6 +213,8 @@ class HotfolderService:
             Anzahl fehlgeschlagener PDFs (0 = alles ok).
         """
         check_preflight(self.cfg.ocr.pdfa_level)
+        check_output_config(self.cfg.output.original_on_success,
+                            self.cfg.output.archive_dir)
         self.ensure_dirs()
         self._scan_existing()
         self._executor.shutdown(wait=True)
@@ -254,6 +272,7 @@ class HotfolderService:
             error_dir=self.cfg.paths.error,
             ocr_cfg=self.cfg.ocr,
             vera_cfg=self.cfg.verapdf,
+            output_cfg=self.cfg.output,
         )
 
         with self._lock: