perf: 优化内存与遥测管理，启用 Vite minify

- 禁用 HISTORY_SNIP feature flag 并新增 proactiveTruncate 防止无 compact_boundary 时内存无限增长
- 跳过未启用 telemetry 时的 OTel 初始化，防止长会话 PerformanceMeasure 堆积
- OTel 导出遇 401/403 自动关闭 reader，防止 handle 泄漏
- Vite 构建启用 minify

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/entrypoints/init.ts

@@ -320,6 +320,16 @@ async function doInitializeTelemetry(): Promise<void> {
     return
   }
 
+  // Skip entire OTel initialization when telemetry is not enabled.
+  // Prevents PerformanceMeasure accumulation in long-running sessions.
+  if (!isEnvTruthy(process.env.CLAUDE_CODE_ENABLE_TELEMETRY)) {
+    telemetryInitialized = true
+    logForDebugging(
+      '[3P telemetry] Skipped — CLAUDE_CODE_ENABLE_TELEMETRY not set',
+    )
+    return
+  }
+
   // Set flag before init to prevent double initialization
   telemetryInitialized = true
   try {