feat(swqos): align endpoint tables with SwqosRegion and document fallbacks

- Extend SWQOS regional constants to 10 entries (Dublin, Singapore, Default)
  so indices match SwqosRegion 0..9 everywhere
- Document geographic nearest-fill among published PoPs; call out Default and
  single-PoP provider constraints in comments
- Fix Node1 QUIC Default endpoint to match HTTP; tune ZeroSlot/Blox/Speedlanding
  regional mappings where a closer published PoP exists
- Add unit tests for table length and Astralane/Node1 cross-table consistency
- Update SwqosRegion rustdoc, README, and trading_client example accordingly

Made-with: Cursor

src/common/types.rs

@@ -12,7 +12,7 @@ pub struct InfrastructureConfig {
     /// When true, SWQOS sender threads use the *last* N cores instead of the first N. Reduces contention with main thread / default tokio workers that often use low-numbered cores. Default false.
     pub swqos_cores_from_end: bool,
     /// Global MEV protection flag. When true, SWQOS providers that support MEV protection
-    /// (Astralane QUIC port 9000, BlockRazor revert_protection) will use their MEV-protected
+    /// (Astralane QUIC `:9000` or HTTP `mev-protect=true`, BlockRazor) use MEV-protected
     /// endpoints/modes. Default false.
     pub mev_protection: bool,
 }
@@ -92,8 +92,8 @@ pub struct TradeConfig {
     /// When true, SWQOS uses the *last* N cores (instead of the first N). Use when main thread / tokio use low-numbered cores to reduce CPU contention. Default false.
     pub swqos_cores_from_end: bool,
     /// Global MEV protection flag. When true, SWQOS providers that support MEV protection
-    /// (Astralane QUIC port 9000, BlockRazor sandwichMitigation mode) will use their
-    /// MEV-protected endpoints/modes. Default false (no MEV protection, lower latency).
+    /// (Astralane QUIC `:9000` or Plain/Binary HTTP `mev-protect=true`, BlockRazor sandwichMitigation)
+    /// use their MEV-protected endpoints/modes. Default false (no MEV protection, lower latency).
     pub mev_protection: bool,
 }
 
@@ -199,7 +199,7 @@ impl TradeConfigBuilder {
     }
 
     /// Enable global MEV protection. When `true`:
-    /// - **Astralane QUIC** uses port `9000` (MEV-protected endpoint)
+    /// - **Astralane QUIC** uses port `9000`; **Astralane HTTP** adds `mev-protect=true`
     /// - **BlockRazor** uses `mode=sandwichMitigation` (skips blacklisted Leader slots)
     ///
     /// May reduce landing speed. Default: `false`.