feat(obs): integrate dial9-tokio-telemetry for runtime tracing (#2285)

Co-authored-by: heihutu <heihutu@gmail.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>

crates/obs/examples/test_dial9_simple.rs

@@ -0,0 +1,45 @@
+// Simple dial9 integration test (reads from environment)
+use rustfs_obs::dial9::{Dial9Config, is_enabled};
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    println!("=== Dial9 Integration Test ===");
+    println!();
+
+    // Test 1: Check current state
+    println!("Test 1: Check dial9 state");
+    println!(
+        "  RUSTFS_RUNTIME_DIAL9_ENABLED: {}",
+        std::env::var("RUSTFS_RUNTIME_DIAL9_ENABLED").unwrap_or("not set".to_string())
+    );
+    println!("  is_enabled(): {}", is_enabled());
+    println!("  ✓ Dial9 state check complete");
+    println!();
+
+    // Test 2: Load configuration
+    println!("Test 2: Load dial9 configuration");
+    let config = Dial9Config::from_env();
+    println!("  enabled: {}", config.enabled);
+    println!("  output_dir: {}", config.output_dir);
+    println!("  file_prefix: {}", config.file_prefix);
+    println!("  max_file_size: {} bytes", config.max_file_size);
+    println!("  rotation_count: {}", config.rotation_count);
+    println!("  sampling_rate: {}", config.sampling_rate);
+    println!("  ✓ Configuration loaded");
+    println!();
+
+    // Test 3: Test base path calculation
+    println!("Test 3: Base path calculation");
+    println!("  base_path: {:?}", config.base_path());
+    println!("  ✓ Base path calculated");
+    println!();
+
+    println!("=== All Tests Passed! ===");
+    println!();
+    println!("Note: To test full dial9 functionality, enable it with:");
+    println!("  export RUSTFS_RUNTIME_DIAL9_ENABLED=true");
+    println!("  export RUSTFS_RUNTIME_DIAL9_OUTPUT_DIR=/tmp/rustfs-telemetry");
+    println!("  cargo run -p rustfs-obs --example test_dial9_simple");
+
+    Ok(())
+}