vendor: add complete multi-platform support (runtime + dev)

- Add vendor-macos-dev target for macOS development wheels
- Add vendor-linux-arm and vendor-linux-arm-dev for ARM64 Linux
- Update vendor-all-dev to include all 3 platforms
- Update install_offline.sh to detect aarch64/arm64/x86_64
- Update .gitignore to track all official vendor directories
- Add clean-vendor and clean targets

Vendor directories now include:
- macos-arm64/ and macos-arm64-dev/
- linux-x86_64/ and linux-x86_64-dev/
- linux-aarch64/ and linux-aarch64-dev/

Supports: Mac (native), x86 Linux servers, ARM64 Linux (Mac containers)

vendor/linux-x86_64/SHA256SUMS

@@ -3,11 +3,11 @@
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-836973be20cf59178f20748a6023a1e0db38a94484fc43fa3a6924b639ee3788  pgpy-0.6.0-py3-none-any.whl
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