fix: harden network interception and bump to 1.3.3

[AmisKwok]

Summary / 摘要

Harden network interception (cryptographic request-ID uniqueness, 512 KB body cap to prevent OOM, safe binary/non-UTF-8 handling) and bump the package and iOS podspec to 1.3.3. / 加固网络拦截（加密级请求 ID 唯一性、512 KB 请求体上限防 OOM、安全的二进制/非 UTF-8 处理），并将包与 iOS podspec 版本提升至 1.3.3。

Changes / 变更

• Unify request-ID generation in InspectorHttpClient and InspectorDioInterceptor to microsecond timestamp + Random.secure() + monotonic counter, eliminating duplicate IDs under concurrency. / 统一 InspectorHttpClient 与 InspectorDioInterceptor 的请求 ID 生成为「微秒时间戳 + Random.secure() + 自增计数器」，消除并发下的重复 ID。
• Cap captured request body at 512 KB and record a truncation note to avoid OOM on large uploads. / 对请求体设置 512 KB 上限并记录截断提示，避免大文件上传时 OOM。
• Fall back safely on non-UTF-8 / binary response bodies instead of throwing. / 对二进制 / 非 UTF-8 响应体做安全回退，避免解析抛错。
• Show "unknown size" when contentLength == -1 in InspectorResponseProxy. / InspectorResponseProxy 在 contentLength == -1 时显示 unknown size。
• Bump pubspec.yaml to 1.3.3 and ios/zero_inspector_kit.podspec to 1.3.3 (was stale at 1.2.2). / pubspec.yaml 升至 1.3.3，ios/zero_inspector_kit.podspec 升至 1.3.3（此前停留在 1.2.2）。
• Update README, README_zh, docs/Installation, and CHANGELOG to 1.3.3. / 同步更新 README、README_zh、docs/Installation 与 CHANGELOG 至 1.3.3。
• Add tests: request_id_collision_test.dart, http_interceptor_test.dart, and a concurrent-ID uniqueness group in models_test.dart. / 新增测试：request_id_collision_test.dart、http_interceptor_test.dart，以及 models_test.dart 中的并发 ID 唯一性测试组。

Context / 背景

Three Trae-generated branches (trae/agent-Ovp5X2, trae/agent-g6rcvw, trae/agent-q9jzwN) each patched part of the same interception robustness issues with overlapping/conflicting edits. They were consolidated into this single branch (Ovp5X2's lib implementation kept as the base, g6rcvw's and q9jzwN's tests merged in) so the fixes ship together in one release. / 三个 Trae 分支各自只修补了同一组拦截健壮性问题的一部分且改动相互冲突，已整合到本分支（以 Ovp5X2 的 lib 实现为基础，合并 g6rcvw 与 q9jzwN 的测试），以便随同一版本发布。

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 passes / flutter analyze 通过
• flutter test passes (173 tests) / flutter test 通过（173 项）
• dart format . reports no changes / dart format . 无改动

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