fix: network capture, WebSocket/gRPC, log interception and UI bug fixes

[AmisKwok]

Summary / 摘要

Fix multiple network-capture correctness bugs (https URL on non-443 ports, Content-Length mismatch in pass-through request-body rule, responses never consumed staying pending, WebSocket/gRPC records never persisted, done returning a different response proxy), plus async errors missed under the init() + wrapApp() two-liner and a memory-leak false-positive without VM Service. / 修复多处网络抓取正确性 bug（非 443 端口的 https URL、直传请求体规则 Content-Length 错配、响应体未消费时永远停在 pending、WebSocket/gRPC 记录从不落盘、done 返回不同响应代理），以及两行式集成漏捕的异步异常、无 VM Service 时的内存泄漏误报。

Changes / 变更

• Network capture correctness fixes (https on non-443, no Content-Length rewrite in pass-through, persist status when body unconsumed, shared response proxy, mixed add()/addStream()) / 网络抓取多项正确性修复
• WebSocket / gRPC records now persist with a synthetic status code; handshake GET shows when WS capture disabled / WebSocket / gRPC 记录落盘，关闭时补状态码
• Log interception captures uncaught async Future/Stream errors via a global isolate listener / 日志拦截通过全局 Isolate 监听捕获未捕获的异步异常
• NetworkRequest.toJson uses jsonEncode for Map/List bodies / toJson 对 Map/List 体改用 jsonEncode
• No auto memory-leak flag without VM Service / 无 VM Service 不再自动判内存泄漏
• UI fixes: stale dock-animation listener, ThrottledNotifier Timer fallback, Dio fallback record, first error-carrying database result kept / 悬浮按钮、节流通知、Dio 回退、数据库首错结果等 UI 修复
• Bump to 1.12.1 and update README / CHANGELOG / docs / 版本升到 1.12.1 并更新文档

Context / 背景

These were the highest-frequency correctness and crash reports from real usage: captured requests stuck in pending, wrong cURL export for non-443 https, async exceptions silently lost, and memory-leak false positives on release/real-device builds. / 这些是真实使用中最频繁的正确性/崩溃反馈：抓取请求卡在 pending、非 443 https 导出 cURL 错误、异步异常静默丢失、release/真机下内存泄漏误报。

Checklist / 检查项

• Title follows Conventional Commits / 标题符合约定式提交
• CI checks pass after merge / 合入后 CI 通过

Test plan

• flutter analyze and flutter test green on CI / CI 上 analyze 与 test 通过
• Verify a non-443 https request exports the correct https:// cURL / 验证非 443 https 请求导出正确的 https cURL
• Verify WebSocket/gRPC records appear in the network list and export archive / 验证 WS/gRPC 记录出现在网络列表与导出存档

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