ci: add setup_android_env.sh with ARM64 NDK fixes + bundled prebuilt tools

[Davinci198]

Summary / 概述 / Rezumat

This PR adds a one-shot Android build environment bootstrap script plus two prebuilt tools, all required to build the app on ARM64 (arm64-v8a) hosts (Termux/proot, ARM servers).

本 PR 添加了一个一键式 Android 构建环境引导脚本，以及两个预编译工具，用于在 ARM64（arm64-v8a）主机（Termux/proot、ARM 服务器）上构建应用。

Acest PR adaugă un script complet de configurare a mediului de build Android plus două tool-uri precompilate, necesare pentru a compila aplicația pe gazde ARM64 (arm64-v8a) (Termux/proot, servere ARM).

---

What it includes / 包含内容 / Ce include

1. setup_android_env.sh (858 lines / 行 / linii)

• Mirror selection / 镜像选择 / selecție mirror: fastest-mirror probing with download-speed measurement + ping fallback for Android command-line tools and Gradle (supports Google / Tsinghua / BFSU / Aliyun / Tencent mirrors).

  • 通过测速 + ping 回退自动选择最快的镜像（Google / 清华 / 北外 / 阿里云 / 腾讯）。
  • Selectare automată a celui mai rapid mirror (Google / Tsinghua / BFSU / Aliyun / Tencent).

• ensure_ndk_arm64_toolchain: replaces the x86-64 NDK linkers with native ARM64 LLVM 18 (ld/ld.lld/lld + llvm-ar/llvm-ranlib/llvm-strip), fixing link crashes and --record-libdeps incompatibility on ARM64.

  • 将 x86-64 NDK 链接器替换为原生 ARM64 LLVM 18，修复 ARM64 上的链接崩溃与 --record-libdeps 不兼容问题。
  • Înlocuiește linker-ele x86-64 din NDK cu LLVM 18 nativ ARM64, rezolvând crash-uri de link și incompatibilitatea --record-libdeps.

• patch_ndk_sysroot_libs: creates stub libgcc.a / libunwind.a / libatomic.a in the NDK sysroot, fixing bad_array_new_length and aligned operator new link errors under NDK 27.

  • 在 NDK sysroot 中创建 libgcc.a/libunwind.a/libatomic.a 桩文件，修复 NDK 27 下的 bad_array_new_length 与对齐 operator new 链接错误。
  • Creează stub-uri libgcc.a/libunwind.a/libatomic.a în sysroot-ul NDK, rezolvând erorile bad_array_new_length și operator new aliniat.

• fix_aidl_arm64: wraps the x86-64 aidl binary with a qemu shim and generates IAccessibilityProvider / IAccessibilityEventCallback (AGP does not generate them).

  • 为 x86-64 aidl 添加 qemu 包装器，并生成 AGP 不会自动生成的 IAccessibilityProvider/IAccessibilityEventCallback。
  • Împachetează binarul x86-64 aidl cu un shim qemu și generează interfețele IAccessibilityProvider/IAccessibilityEventCallback (AGP nu le generează).

• ensure_native_libs: offline copy of dragonbones-release.aar v1.1.0 from tools/dragonbones (SHA256-verified) + optional ffmpeg-kit-local.aar check.

  • 从 tools/dragonbones 离线复制 dragonbones-release.aar v1.1.0（SHA256 校验）+ 可选 ffmpeg-kit-local.aar 检查。
  • Copie offline a dragonbones-release.aar v1.1.0 din tools/dragonbones (SHA256 verificat) + verificare opțională pentru ffmpeg-kit-local.aar.

• replace_aapt2: swaps the SDK/Gradle-cache aapt2 with the bundled ARM64 binary so resource processing works on ARM64.

  • 用随附的 ARM64 二进制替换 SDK/Gradle 缓存中的 aapt2，确保资源处理在 ARM64 上正常工作。
  • Înlocuiește aapt2-ul din SDK/cache-ul Gradle cu binarul ARM64 inclus, pentru ca procesarea resurselor să funcționeze pe ARM64.

• proot/Termux compatibility / proot/Termux 兼容 / compatibilitate proot/Termux: disables the AAPT2 daemon, restores a safe gradle.properties, persists env vars in ~/.bashrc, and writes local.properties.

2. tools/aapt2/aapt2-arm64-v8a — native ARM64 AAPT2 (ELF aarch64, statically linked, sha256 e5b5ff7f…) bundled in the repo; no Gradle cache patching needed.

• 原生 ARM64 AAPT2（ELF aarch64），直接入库，无需修补 Gradle 缓存。
• AAPT2 nativ ARM64 (ELF aarch64) inclus în repo; nu mai e nevoie de patch pe cache-ul Gradle.

3. tools/dragonbones/dragonbones-release.aar — prebuilt DragonBones v1.1.0 (sha256 639238ed…) bundled for fully offline builds.

• 预编译 DragonBones v1.1.0，支持完全离线构建。
• DragonBones v1.1.0 precompilat, pentru build-uri complet offline.

---

Validation / 验证 / Validare

• bash -n setup_android_env.sh — syntax OK (语法通过 / sintaxă OK)
• git diff --check — no whitespace errors (无空白错误 / fără erori de whitespace)
• ci/script/check_repo_hygiene.py --base main --candidate HEAD → errors=0 warnings=0
• ci/script/check_markdown_links.py → errors=0 warnings=0
• Prebuilt binary checksums verified against the values embedded in the script.
  • 预编译二进制校验和与脚本内嵌值一致。
  • Checksum-urile binarelor precompilate corespund cu valorile din script.

---

Testing / 测试 / Testare

The same change set has been merged and validated in Davinci198/fix-operit (PR #12, checks SUCCESS): full ARM64 native build pipeline (mmd + llama passed). This PR ports those validated fixes to this repository.

相同变更已在 Davinci198/fix-operit 中合并并验证（PR #12，检查全部通过）：完整的 ARM64 原生构建流水线（mmd + llama 均通过）。本 PR 将这些已验证的修复移植到本仓库。

Aceleași modificări au fost deja merge-uite și validate în Davinci198/fix-operit (PR #12, checks SUCCESS): pipeline-ul complet de build nativ ARM64 (mmd + llama au trecut). Acest PR portează acele fix-uri validate către acest repo.

---

Closes (if applicable / 若适用 / dacă e cazul): ARM64 build support (Termux/proot / ARM servers).

[AAswordman]

Request changes.\n\nP1: Running setup_android_env.sh overwrites tracked project files (gradle/wrapper/gradle-wrapper.properties, gradle.properties, and gradlew.bat) and appends persistent settings to ~/.bashrc. It discards existing Gradle settings such as the repository's 8 GiB JVM allocation and changes the wrapper to a machine-local file URL. A setup helper must not silently rewrite repository/user configuration; constrain writes to explicitly requested, local-only configuration.\n\nP1: The two added opaque binaries total about 7.2 MB. The script only verifies their self-declared SHA-256 values, which proves neither source nor provenance. Provide official upstream/reproducible-build provenance, version/license metadata, and a reviewable acquisition path before adding them to the repository.\n\nP1: Several prerequisite failures are logged and then ignored, yet the script still prints that setup completed. In particular, failed Gradle/AAPT2 warm-ups and failed AIDL generation do not prevent success. This can report a usable environment when required build tools are unavailable.\n\nThe branch has no Candidate checks and is based behind current main.

[Davinci198]

Bye