feat: default auto lat-top and speed-top to 0 (keep all)

- lat-top now defaults to 0 so every IP within --lat-max feeds the speed
  stage, instead of capping at the fastest 30
- speed-top now defaults to 0 so every IP passing --min-speed is written
  to result.txt, instead of capping at 10
- downstream truncation already treats 0 as keep-all; update README

README.md

@@ -92,8 +92,8 @@ flowchart LR
 | --- | --- | --- |
 | `[NODE]` / `--node-file` | — | 节点 URL,或从文件读取 |
 | `-n, --count` | 50 | 阶段 1 收集的有效 IP 数 |
-| `--lat-top` | 30 | 阶段 2 保留的最快 IP 数 |
-| `--speed-top` | 10 | 最终节点数 |
+| `--lat-top` | 0 | 阶段 2 保留的最快 IP 数(0 = 全部) |
+| `--speed-top` | 0 | 最终节点数(0 = 全部) |
 | `--speed-concurrency` | 1 | 测速并发数(1 最准,调大更快) |
 | `-6, --ipv6` | off | 同时测 IPv6 |
 | `--ping-max` | 300 | 第一次 ping(TCP)延迟上限 ms |

src/cli.rs

@@ -47,11 +47,12 @@ pub(crate) struct AutoArgs {
     pub(crate) count: usize,
 
     /// Stage 2: keep the fastest N after latency (feeds the speed stage).
-    #[arg(long, default_value_t = 30)]
+    /// 0 = keep all that pass.
+    #[arg(long, default_value_t = 0)]
     pub(crate) lat_top: usize,
 
-    /// Stage 3: final node count written to result.txt.
-    #[arg(long, default_value_t = 10)]
+    /// Stage 3: final node count written to result.txt. 0 = keep all.
+    #[arg(long, default_value_t = 0)]
     pub(crate) speed_top: usize,
 
     /// Stage 3: concurrent downloads during the speed test (1 = most accurate).