feat: Add Document Crawler & Auto-Onboarding service (Phase 1.4)

New standalone Python/FastAPI service for automatic compliance document
scanning, LLM-based classification, IPFS archival, and gap analysis.
Includes extractors (PDF, DOCX, XLSX, PPTX), keyword fallback classifier,
compliance matrix, and full REST API on port 8098.

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

document-crawler/extractors/pdf_extractor.py

@@ -0,0 +1,15 @@
+"""PDF text extraction using PyMuPDF (fitz)."""
+
+import fitz
+
+
+def extract_pdf(file_path: str) -> str:
+    """Extract text from a PDF file."""
+    doc = fitz.open(file_path)
+    pages = []
+    for page in doc:
+        text = page.get_text()
+        if text.strip():
+            pages.append(text)
+    doc.close()
+    return "\n\n".join(pages)