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/QueryEngine.ts

@@ -1003,6 +1003,15 @@ export class QueryEngine {
               uuid: msg.uuid,
             }
           }
+          // Proactive truncation: prevent unbounded growth when API doesn't
+          // return compact_boundary (e.g. third-party compat layers).
+          if (feature('HISTORY_SNIP') && snipModule) {
+            const truncated = snipModule.proactiveTruncate(this.mutableMessages)
+            if (truncated !== this.mutableMessages) {
+              this.mutableMessages.length = 0
+              this.mutableMessages.push(...truncated)
+            }
+          }
           // Don't yield other system messages in headless mode
           break
         }