revert: rollback AHashMap changes and keep using std HashMap (#6741)

* Revert "perf(ecstore): use AHashMap for FileInfo metadata fields (#6738)"

This reverts commit 13a2ae212e.

* fix(filemeta): restore standard HashMap metadata (#6742)

Remove the direct ahash dependency added for FileInfo metadata and revert the affected filemeta/ecstore call sites back to std::collections::HashMap.

Co-authored-by: heihutu <heihutu@gmail.com>

---------

Co-authored-by: heihutu <heihutu@gmail.com>

crates/filemeta/Cargo.toml

@@ -51,9 +51,6 @@ s3s = { workspace = true, features = ["minio"] }
 regex.workspace = true
 arc-swap.workspace = true
 
-# High-performance hashing
-ahash = { workspace = true, features = ["serde"] }
-
 [dev-dependencies]
 criterion = { workspace = true, features = ["html_reports"] }
 tempfile = { workspace = true }