feat(memory): propagate temporal validity fields through extraction pipeline

- Add valid_at/invalid_at passthrough in triplet extraction prompt (both zh/en)
- Propagate temporal_validity to EntityEntityEdge in ExtractionOrchestrator
- Use coalesce() for valid_at/invalid_at in Neo4j cypher queries to handle NULLs
- Fix workspace_id/config_id UUID parsing in read_memory config resolution
- Downgrade verbose extraction pipeline logs from info to debug
- Remove UUID and short API key patterns from sensitive filter to reduce false positives
- Standardize log message format (use = spacing, end_user_id label)
- Fix misindented TODO comment in write_pipeline.py

api/app/repositories/neo4j/cypher_queries.py

@@ -33,8 +33,8 @@ SET s += {
     temporal_info: statement.temporal_info,
     created_at: statement.created_at,
     expired_at: statement.expired_at,
-    valid_at: statement.valid_at,
-    invalid_at: statement.invalid_at,
+    valid_at: coalesce(statement.valid_at, ""),
+    invalid_at: coalesce(statement.invalid_at, ""),
     statement_embedding: statement.statement_embedding,
     relevence_info: statement.relevence_info,
     importance_score: statement.importance_score,
@@ -152,8 +152,8 @@ SET r.predicate = rel.predicate,
     r.statement_id = rel.statement_id,
     r.value = rel.value,
     r.statement = rel.statement,
-    r.valid_at = rel.valid_at,
-    r.invalid_at = rel.invalid_at,
+    r.valid_at = coalesce(rel.valid_at, ""),
+    r.invalid_at = coalesce(rel.invalid_at, ""),
     r.created_at = rel.created_at,
     r.expired_at = rel.expired_at,
     r.run_id = rel.run_id,