chore: relicense to MPL-2.0 and bump version to 1.10.0

[AmisKwok]

Summary / 摘要

Relicenses the plugin from GPL-3.0 to MPL-2.0 and bumps the version to 1.10.0. / 将插件许可证由 GPL-3.0 更换为 MPL-2.0，版本提升至 1.10.0。

Changes / 变更

• LICENSE replaced with the official Mozilla Public License 2.0 text, prefixed with the copyright notice and suffixed with additional statements (no warranty / no liability for modified or derivative versions, modified versions must be marked, no endorsement using the project name, logo, mascot or author's name, original copyright is not transferred). / LICENSE 替换为 MPL-2.0 官方全文，前置版权声明，并追加附加声明（修改版/衍生版无担保且不承担责任、修改版须标注、禁止以项目名/Logo/吉祥物/作者名义背书、原始版权不转移）。
• pubspec.yaml: version: 1.9.1 → 1.10.0, license: GPL-3.0-only → MPL-2.0. / 版本升至 1.10.0，许可证字段改为 MPL-2.0。
• ios/zero_inspector_kit.podspec: s.version → '1.10.0'. / iOS podspec 版本同步。
• README.md / README_zh.md: license badge, rewritten License section (commercial use allowed; modified files must be published, unmodified use needs no disclosure; no endorsement; no warranty), ^1.10.0, ref: release/v1.10.0, and the upgrade callout. / 许可证徽章、许可证段重写（允许商用；改了才需公开，未改无需公开；禁止背书；免责），版本位同步。
• website/pages/FAQ.md, website/theme.config.tsx, CONTRIBUTING.md, AGENTS.md, CHANGELOG.md updated for the new license and the new ## 1.10.0 entry. / 站点 FAQ、页脚、贡献指南、AGENTS 与新 ## 1.10.0 变更日志同步更新。

Context / 背景

GPL-3.0 required every app that merely used the plugin to be open-sourced, which is stricter than intended. The maintainer wants: commercial use and closed-source distribution allowed; if the plugin's source is modified, the modified files must be published under MPL-2.0; if used unmodified, no disclosure is required. MPL-2.0 is file-level copyleft and matches exactly. / GPL-3.0 要求仅"使用"插件的 App 也开源，比预期更严格。维护者的诉求是：允许商用与闭源分发；修改插件源码时须公开被修改的文件；未修改则无需公开。MPL-2.0 的文件级 copyleft 正好匹配。

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 pub get resolves and flutter pub publish --dry-run reports 1.10.0 with 0 warnings / 依赖解析正常，dry-run 显示 1.10.0 且 0 warnings
• GitHub detects the repository license as "Mozilla Public License 2.0" / GitHub 识别仓库许可证为 MPL-2.0
• README / README_zh License section renders correctly on pub.dev / pub.dev 上许可证说明排版正常

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