refactor(memory): restructure memory search architecture

- Replace storage_services/search with new read_services/memory_search structure
- Implement content_search and perceptual_search strategies
- Add query_preprocessor for search optimization
- Create memory_service as unified interface
- Update celery_app and graph_search for new architecture
- Add enums for memory operations
- Implement base_pipeline and memory_read pipeline patterns

api/app/repositories/neo4j/cypher_queries.py

@@ -1452,6 +1452,30 @@ ON CREATE SET r.end_user_id = edge.end_user_id,
 RETURN elementId(r) AS uuid
 """
 
+SEARCH_PERCEPTUAL_BY_USER_ID = """
+MATCH (p:Perceptual)
+WHERE p.end_user_id = $end_user_id
+RETURN p.id AS id,
+       p.summary_embedding AS summary_embedding
+"""
+
+SEARCH_PERCEPTUAL_BY_IDS = """
+MATCH (p:Perceptual)
+WHERE p.id IN $ids
+RETURN p.id AS id,
+       p.end_user_id AS end_user_id,
+       p.perceptual_type AS perceptual_type,
+       p.file_path AS file_path,
+       p.file_name AS file_name,
+       p.file_ext AS file_ext,
+       p.summary AS summary,
+       p.keywords AS keywords,
+       p.topic AS topic,
+       p.domain AS domain,
+       p.created_at AS created_at,
+       p.file_type AS file_type
+"""
+
 SEARCH_PERCEPTUAL_BY_KEYWORD = """
 CALL db.index.fulltext.queryNodes("perceptualFulltext", $query) YIELD node AS p, score
 WHERE p.end_user_id = $end_user_id
@@ -1471,24 +1495,3 @@ RETURN p.id AS id,
 ORDER BY score DESC
 LIMIT $limit
 """
-
-PERCEPTUAL_EMBEDDING_SEARCH = """
-CALL db.index.vector.queryNodes('perceptual_summary_embedding_index', $limit * 100, $embedding)
-YIELD node AS p, score
-WHERE p.summary_embedding IS NOT NULL AND p.end_user_id = $end_user_id
-RETURN p.id AS id,
-       p.end_user_id AS end_user_id,
-       p.perceptual_type AS perceptual_type,
-       p.file_path AS file_path,
-       p.file_name AS file_name,
-       p.file_ext AS file_ext,
-       p.summary AS summary,
-       p.keywords AS keywords,
-       p.topic AS topic,
-       p.domain AS domain,
-       p.created_at AS created_at,
-       p.file_type AS file_type,
-       score
-ORDER BY score DESC
-LIMIT $limit
-"""