feat: extend hotpath coverage across crates

Add opt-in hotpath feature surfaces to every workspace crate and wire the root rustfs feature passthrough for function, allocation, and CPU profiling.

Add a focused set of function-level measurements for scanner, heal, lock, target replay, IAM, KMS, Keystone, trusted proxy, and capacity paths without adding request-scoped primitive wrappers.

Co-Authored-By: heihutu <heihutu@gmail.com>

crates/notify/Cargo.toml

@@ -26,9 +26,40 @@ categories = ["web-programming", "development-tools", "filesystem"]
 documentation = "https://docs.rs/rustfs-notify/latest/rustfs_notify/"
 
 [features]
+hotpath = [
+    "hotpath/hotpath",
+    "hotpath/tokio",
+    "rustfs-config/hotpath",
+    "rustfs-ecstore/hotpath",
+    "rustfs-s3-ops/hotpath",
+    "rustfs-s3-types/hotpath",
+    "rustfs-targets/hotpath",
+    "rustfs-utils/hotpath",
+]
+hotpath-alloc = [
+    "hotpath",
+    "hotpath/hotpath-alloc",
+    "rustfs-config/hotpath-alloc",
+    "rustfs-ecstore/hotpath-alloc",
+    "rustfs-s3-ops/hotpath-alloc",
+    "rustfs-s3-types/hotpath-alloc",
+    "rustfs-targets/hotpath-alloc",
+    "rustfs-utils/hotpath-alloc",
+]
+hotpath-cpu = [
+    "hotpath",
+    "hotpath/hotpath-cpu",
+    "rustfs-config/hotpath-cpu",
+    "rustfs-ecstore/hotpath-cpu",
+    "rustfs-s3-ops/hotpath-cpu",
+    "rustfs-s3-types/hotpath-cpu",
+    "rustfs-targets/hotpath-cpu",
+    "rustfs-utils/hotpath-cpu",
+]
 demo-examples = []
 
 [dependencies]
+hotpath.workspace = true
 rustfs-config = { workspace = true, features = ["notify", "server-config-model"] }
 rustfs-ecstore = { workspace = true }
 rustfs-s3-types = { workspace = true }