fix: declare global and per_key as modules so common.rs items are reachable

Without pub mod global and pub mod per_key in mod.rs, the compiler sees all
types in common.rs as dead code and fails under -D warnings.

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

Author: zz_y

asap-query-engine/src/stores/simple_map_store/mod.rs

@@ -1,5 +1,7 @@
 mod common;
+pub mod global;
 pub mod legacy;
+pub mod per_key;
 
 use crate::data_model::{
     AggregateCore, CleanupPolicy, LockStrategy, PrecomputedOutput, StreamingConfig,