feat(api): wire opt-in per-client S3 API rate limiting (429 + Retry-After) (#4895)

feat(api): wire opt-in per-client S3 API rate limiting (backlog#1191)

RustFS shipped three rate-limiter implementations and none was wired to
any request path: the tower layer never returned 429 (its over-limit
branch passed requests through) and was never instantiated, the console
env switches only logged, and the Swift token bucket was never called.

Replace them with one working, default-off implementation:

- Rewrite rustfs/src/server/rate_limit.rs as a sharded per-client-IP
  token-bucket limiter (32 mutex shards instead of one global RwLock
  write per request), bounded at 100k tracked IPs with lossless
  refilled-idle sweeps, returning 429 + Retry-After + x-ratelimit-*
  headers and an S3-style XML body.
- Key on trusted-proxy-validated ClientInfo.real_ip, else the socket
  peer address; never read spoofable X-Forwarded-For/X-Real-IP headers.
  Requests without a resolvable identity fail open. The echoed request
  id is charset-gated to prevent reflected XML injection.
- Wire the layer once at startup via option_layer between
  CatchPanicLayer and ReadinessGateLayer (external stack only), gated by
  new RUSTFS_API_RATE_LIMIT_ENABLE/_RPM/_BURST constants; health and
  profiling probes, internode RPC/gRPC, and the console are exempt.
- Make RUSTFS_CONSOLE_RATE_LIMIT_ENABLE/_RPM actually enforce by
  reusing the same limiter core through an axum middleware.
- Delete the dead Swift ratelimit module, its isolated tests, and the
  stale logging-guardrail entry; keep the live SwiftError 429 mapping.
- Add unit tests (exhaustion/recovery with injected time, concurrency,
  cap eviction, spoofed-header and fail-open behavior, env matrix) and
  e2e tests proving 429 + Retry-After on the real server and zero
  behavior change with default configuration.

crates/protocols/tests/swift_simple_integration.rs

@@ -16,7 +16,7 @@
 
 #![cfg(feature = "swift")]
 
-use rustfs_protocols::swift::{quota, ratelimit, slo, symlink, sync, tempurl, versioning};
+use rustfs_protocols::swift::{quota, slo, symlink, sync, tempurl, versioning};
 use std::collections::HashMap;
 
 /// Test sync configuration parsing
@@ -92,14 +92,6 @@ fn test_symlink_detection() {
     let _is_symlink = symlink::is_symlink(&metadata);
 }
 
-/// Test rate limit parsing
-#[test]
-fn test_rate_limit_parsing() {
-    let rl = ratelimit::RateLimit::parse("100/60").unwrap();
-    assert_eq!(rl.limit, 100);
-    assert_eq!(rl.window_seconds, 60);
-}
-
 /// Test quota structure
 #[test]
 fn test_quota_structure() {