refactor(docs): consolidate and cleanup documentation

- Delete 9 deprecated/obsolete docs (~6,300 lines removed)
- Move test PDFs to tests/fixtures/ocr-samples/
- Create docs/DEPLOYMENT.md as principal guide
- Create tests/ocr-validation/README.md
- Update all refs for ultrathin monolith architecture
- Update OCR tests to use relative paths

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/ocr-validation/test_receipts_parallel.py

@@ -10,8 +10,13 @@ from datetime import datetime, timedelta
 from jose import jwt
 
 API_BASE = "http://localhost:8000"
-PDF_FOLDER = "/mnt/e/proiecte/ab-worktrees/doctr-ocr-metrics/docs/data-entry"
-EXPECTED_FILE = "/mnt/e/proiecte/ab-worktrees/doctr-ocr-metrics/tests/ocr-validation/expected_receipts.json"
+
+# Paths - relative to project root
+from pathlib import Path
+SCRIPT_DIR = Path(__file__).parent
+PROJECT_ROOT = SCRIPT_DIR.parent.parent
+PDF_FOLDER = str(PROJECT_ROOT / "tests" / "fixtures" / "ocr-samples")
+EXPECTED_FILE = str(SCRIPT_DIR / "expected_receipts.json")
 
 def get_jwt_token():
     secret_key = os.getenv('JWT_SECRET_KEY', 'generate_with_secrets_token_urlsafe_32')