feat: major gas fee strategy and documentation overhaul

- feat(gas): add comprehensive gas fee strategy management system
  * Implement GasFeeStrategyType with Default/LowTipHighCuPrice/HighTipLowCuPrice strategies
  * Add dynamic gas fee configuration per SWQOS service and trade type
  * Integrate arc-swap for thread-safe strategy updates

- docs: restructure documentation with dedicated guides
  * Add ADDRESS_LOOKUP_TABLE.md/CN.md for lookup table configuration
  * Add NONCE_CACHE.md/CN.md for nonce management documentation
  * Add TRADING_PARAMETERS.md/CN.md for comprehensive parameter guides
  * Simplify main README.md with focused overview

- refactor: update all examples with new gas fee strategy integration
  * Modernize 14 trading examples with consistent parameter handling
  * Improve error handling and configuration management
  * Enhance parallel trading implementation

src/common/nonce_cache.rs

@@ -15,8 +15,6 @@ pub struct NonceInfo {
     pub nonce_account: Option<Pubkey>,
     /// Current nonce value
     pub current_nonce: Hash,
-    /// Next available time (Unix timestamp in seconds)
-    pub next_buy_time: i64,
     /// Whether it has been used
     pub used: bool,
 }
@@ -39,7 +37,6 @@ impl NonceCache {
                     nonce_info: Mutex::new(NonceInfo {
                         nonce_account: None,
                         current_nonce: Hash::default(),
-                        next_buy_time: 0,
                         used: false,
                     }),
                 })
@@ -50,7 +47,7 @@ impl NonceCache {
     /// Initialize nonce information
     pub fn init(&self, nonce_account_str: Option<String>) {
         let nonce_account = nonce_account_str.and_then(|s| Pubkey::from_str(&s).ok());
-        self.update_nonce_info_partial(nonce_account, None, None, Some(false));
+        self.update_nonce_info_partial(nonce_account, None, Some(false));
     }
 
     /// Get a copy of NonceInfo
@@ -59,7 +56,6 @@ impl NonceCache {
         NonceInfo {
             nonce_account: nonce_info.nonce_account,
             current_nonce: nonce_info.current_nonce,
-            next_buy_time: nonce_info.next_buy_time,
             used: nonce_info.used,
         }
     }
@@ -69,7 +65,6 @@ impl NonceCache {
         &self,
         nonce_account: Option<Pubkey>,
         current_nonce: Option<Hash>,
-        next_buy_time: Option<i64>,
         used: Option<bool>,
     ) {
         let mut current = self.nonce_info.lock();
@@ -83,10 +78,6 @@ impl NonceCache {
             current.current_nonce = nonce;
         }
 
-        if let Some(time) = next_buy_time {
-            current.next_buy_time = time;
-        }
-
         if let Some(u) = used {
             current.used = u;
         }
@@ -94,7 +85,7 @@ impl NonceCache {
 
     /// Mark nonce as used
     pub fn mark_used(&self) {
-        self.update_nonce_info_partial(None, None, None, Some(true));
+        self.update_nonce_info_partial(None, None, Some(true));
     }
 
     /// Fetch nonce information using RPC
@@ -109,12 +100,7 @@ impl NonceCache {
                         let blockhash = data.durable_nonce.as_hash();
                         let old_nonce_info = self.get_nonce_info();
                         if old_nonce_info.current_nonce != *blockhash {
-                            self.update_nonce_info_partial(
-                                None,
-                                Some(*blockhash),
-                                None,
-                                Some(false),
-                            );
+                            self.update_nonce_info_partial(None, Some(*blockhash), Some(false));
                         }
                     }
                 }