fix(qdrant): reject mixed range and non-range filter operators

Raise ValueError when a filter dict for a single field combines range
operators (gt/gte/lt/lte) with non-range operators (eq/ne/in/nin/etc),
preventing silent data loss where the non-range conditions were dropped.

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

tests/vector_stores/test_qdrant.py

@@ -541,5 +541,15 @@ class TestQdrantEnhancedFilters(unittest.TestCase):
             self.qdrant._build_field_condition("field", {"unknown_op": "foo"})
         self.assertIn("Unsupported", str(ctx.exception))
 
+    def test_mixed_range_and_non_range_raises_error(self):
+        """Mixing range ops with non-range ops should raise ValueError."""
+        with self.assertRaises(ValueError):
+            self.qdrant._build_field_condition("priority", {"gte": 5, "ne": 10})
+
+    def test_mixed_range_and_eq_raises_error(self):
+        """Mixing range ops with eq should raise ValueError."""
+        with self.assertRaises(ValueError):
+            self.qdrant._build_field_condition("score", {"gt": 0.5, "eq": 1.0})
+
     def tearDown(self):
         del self.qdrant