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-aarch64/SHA256SUMS

@@ -3,11 +3,11 @@
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 b21e08af67b8a103c71a250401c78d5e0893beff75e28c53c98f4de42f774062  cffi-2.0.0-cp312-cp312-manylinux2014_aarch64.manylinux_2_17_aarch64.whl
 5a366c314df7217e3357bb8c7d2cda540b0bce180705f7a0ce2d1d9e28f62ad4  coincurve-21.0.0-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
-366e6f9cf39cb1a3d6656ff911b71cb3bcd92cb6510c1bece7c128dd7ba2697c  crcmod-1.7-cp312-cp312-linux_aarch64.whl
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 549e234ff32571b1f4076ac269fcce7a808d3bf98b76c8dd560e42dbc66d7d91  cryptography-46.0.3-cp311-abi3-manylinux_2_34_aarch64.whl
 30638e27cf77b7e15c4c4cc1973720149e1033827cfd00661ca5c8cc0cdb24c3  ecdsa-0.19.1-py2.py3-none-any.whl
-cce822d4a1bbe91061a66e0c3148d15b1c1ac5dd7cd9e8ea23ca1b7aa85ba817  ed25519_blake2b-1.4.1-cp312-cp312-linux_aarch64.whl
-6b1e33c6af6dc080855090101cda8bfd293119cdbc36bcf99554a0efc5780a89  pgpy-0.6.0-py3-none-any.whl
+6b5b3f442d17fb6c471d9aa7c2c6fc596209ca2b6553b836d323b510536c9f79  ed25519_blake2b-1.4.1-cp312-cp312-linux_aarch64.whl
+d8c2ef2c6b5ba85878b9eeb79f6697a9a21969ee73880df38a7b607127d8fbd1  pgpy-0.6.0-py3-none-any.whl
 a3929c291408e67a1a11566f251b9f7d06c3fb3ae240caec44b9181de09e3fc9  py_sr25519_bindings-0.2.3-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
 0d632f46f2ba09143da3a8afe9e33fb6f92fa2320ab7e886e2d0f7672af84629  pyasn1-0.6.1-py3-none-any.whl
 e5c6e8d3fbad53479cab09ac03729e0a9faf2bee3db8208a550daf5af81a5934  pycparser-2.23-py3-none-any.whl