feat: PDF-Parser VR/HVB/DKB mit Registry und Fixture-Tests

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

finance/app/parsers/registry.py

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+from pathlib import Path
+from typing import Callable
+
+import pdfplumber
+
+from app.parsers import dkb, hvb, vr
+from app.parsers.base import ParsedStatement, ParserError
+from app.parsers.detect import detect_bank
+
+PARSERS: dict[str, Callable[[Path], ParsedStatement]] = {
+    "vr": vr.parse, "hvb": hvb.parse, "dkb": dkb.parse,
+}
+
+
+def parse_pdf(path: Path) -> ParsedStatement:
+    with pdfplumber.open(path) as pdf:
+        first = pdf.pages[0].extract_text() or ""
+    bank = detect_bank(first)
+    if bank is None:
+        raise ParserError("Bank nicht erkannt")
+    return PARSERS[bank](path)