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/get_raw_ocr_text.py

@@ -113,10 +113,11 @@ if __name__ == "__main__":
     print(f"Using JWT token for authentication")
 
     if len(sys.argv) < 2:
-        # Default: process the two receipts user wants to see
+        # Default: process sample receipts from fixtures
+        fixtures_dir = Path(__file__).parent.parent / "fixtures" / "ocr-samples"
         receipts = [
-            "/mnt/e/proiecte/ab-worktrees/doctr-ocr-metrics/docs/data-entry/brick igiena 1 sept.pdf",
-            "/mnt/e/proiecte/ab-worktrees/doctr-ocr-metrics/docs/data-entry/brick igiena, electrice consumabile 604.pdf"
+            str(fixtures_dir / "brick igiena 1 sept.pdf"),
+            str(fixtures_dir / "brick igiena, electrice consumabile 604.pdf")
         ]
     else:
         receipts = sys.argv[1:]