feat: add offset_x/offset_y to analyze response for alignment guess

Co-Authored-By: Claude Opus 4.6 <[email protected]>

tests/test_app.py

@@ -97,6 +97,10 @@ async def test_redaction_analyze(pdf_bytes: bytes):
         assert data["gap"]["w"] > 0
         assert data["font"]["name"]
         assert data["font"]["size"] > 0
+        assert "offset_x" in data
+        assert "offset_y" in data
+        assert isinstance(data["offset_x"], (int, float))
+        assert isinstance(data["offset_y"], (int, float))
 
 
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