feat(rustproxy): use tikv-jemallocator as the global allocator to reduce glibc fragmentation and slow RSS growth; add allocator dependency and enable it in rustproxy, update lockfile, and run tsrust before tests

rust/Cargo.toml

@@ -91,6 +91,9 @@ libc = "0.2"
 # Socket-level options (keepalive, etc.)
 socket2 = { version = "0.5", features = ["all"] }
 
+# jemalloc allocator (prevents glibc fragmentation / slow RSS growth)
+tikv-jemallocator = "0.6"
+
 # Internal crates
 rustproxy-config = { path = "crates/rustproxy-config" }
 rustproxy-routing = { path = "crates/rustproxy-routing" }