Release v3.6.4: bump version, update README (EN/CN), ensure all examples build

- Bump version to 3.6.4 in Cargo.toml
- Update version references in README.md and README_CN.md
- Add RELEASE_v3.6.4.md with English release notes
- All workspace examples verified to compile (cargo build --workspace)
- Remove RELEASE_v3.6.3.md and docs/ASYNC_EXECUTOR_REVIEW.md
- Minor updates in types, lib, transaction_builder, async_executor, executor, params

Made-with: Cursor

src/common/types.rs

@@ -68,12 +68,6 @@ pub struct TradeConfig {
     pub create_wsol_ata_on_startup: bool,
     /// Whether to use seed optimization for all ATA operations (default: true)
     pub use_seed_optimize: bool,
-    /// Whether to pin parallel submit tasks to CPU cores (can reduce latency; set false in containers). Default true.
-    pub use_core_affinity: bool,
-    /// Use dedicated OS threads for sender pool (opt-in). When true, N threads run only send work; default N=18. Reduces scheduling contention when sending many txs. Default false.
-    pub use_dedicated_sender_threads: bool,
-    /// When use_dedicated_sender_threads is true, core indices to pin each sender thread to. If None or empty, N=SWQOS_DEDICATED_DEFAULT_THREADS with no affinity. If Some(ids), N=ids.len() and threads are pinned to these cores. Arc avoids cloning the Vec when building params.
-    pub sender_thread_cores: Option<std::sync::Arc<Vec<usize>>>,
     /// Whether to output all SDK logs (timing, SWQOS submit/confirm, WSOL, blacklist, etc.). Default true.
     pub log_enabled: bool,
     /// Whether to check minimum tip per SWQOS provider (filter out configs below min). Default false to save latency.
@@ -95,11 +89,8 @@ impl TradeConfig {
             swqos_configs,
             commitment,
             create_wsol_ata_on_startup: true, // default: check and create on startup
-            use_seed_optimize: true,          // default: use seed optimization
-            use_core_affinity: true,          // default: pin parallel submit tasks to cores
-            use_dedicated_sender_threads: false, // default: use tokio worker pool
-            sender_thread_cores: None,        // when dedicated threads enabled, which cores to pin (None => default count, no affinity)
-            log_enabled: true,                // default: enable all SDK logs
+            use_seed_optimize: true, // default: use seed optimization
+            log_enabled: true,      // default: enable all SDK logs
             check_min_tip: false,             // default: skip min tip check to reduce latency
         }
     }