Add aarch64/ARM64 Linux build support

[digital-shokunin]

Summary

• Detect host architecture at build time (uname -m) and select the appropriate funchook disassembler: capstone for aarch64 (as funchook recommends), distorm for x86_64
• Auto-detect CUDA include and stub paths on aarch64 (sbsa-linux target), falling back to sensible defaults
• Allow CUDA_INCLUDE_DIR and CUDA_STUB_DIR env var overrides for non-standard CUDA installations
• No changes to x86_64 behavior — existing defaults are preserved

Motivation

Resolves #33. The aimdo.so binary is not included in the pip wheel for aarch64, so init_device() fails and ComfyUI falls back to the legacy ModelPatcher with unreliable VRAM estimates. This is particularly impactful on unified-memory devices like the NVIDIA DGX Spark (GB10) where the legacy patcher frequently offloads entire models to CPU despite having 120+ GB of usable VRAM.

Test environment

• NVIDIA DGX Spark (GB10, compute capability 12.1)
• Ubuntu 24.04 aarch64, CUDA 13.0, driver 580.142
• gcc 13.3.0, cmake 3.28.3
• funchook 1.1.3 with capstone disassembler
• ComfyUI 0.19.3+ with comfy-aimdo 0.2.12

Build and runtime output:

aimdo: src-posix/cuda-funchooks.c:62:DEBUG:aimdo_setup_hooks: hooks successfully installed
aimdo: src/control.c:138:INFO:comfy-aimdo inited for GPU: NVIDIA GB10 (VRAM: 122566 MB)
DynamicVRAM support detected and enabled

Test plan

• Native build on aarch64 (DGX Spark) — compiles without errors
• init_device(0) returns True with active CUDA context
• ComfyUI logs "DynamicVRAM support detected and enabled" on startup
• Verify x86_64 build is unaffected (no aarch64 hardware change to x86 path)

🤖 Generated with Claude Code

[rattus128]

I just merged #35 which is going to conflict here. That should make life easier after the rebase as we dont have cuda (or hip) as a build-time dep anymore.

[rattus128]

For Is and Ts can you accept the contributor agreement by either pull description edit or reply here? We are using a dual license arrangement for Aimdo.

### Contribution Agreement
- [ ] I agree that my contributions are licensed under the GPLv3.
- [ ] I grant **Comfy Org** the rights to relicense these contributions as outlined in [CONTRIBUTING.md](./CONTRIBUTING.md).

Otherwise, I merged this to a dev/ branch, resolved conflicts and there are some wheels here:

https://github.com/Comfy-Org/comfy-aimdo/actions/runs/24751946012

I'm arranging access to a DGX spark so I can test this myself, and then ill PR the dev/ branch.

[digital-shokunin]

I'll take a look and see if I can resolve the conflicts, thanks

[digital-shokunin]

Contribution Agreement

• I agree that my contributions are licensed under the GPLv3.
• I grant Comfy Org the rights to relicense these contributions as outlined in CONTRIBUTING.md.

[digital-shokunin]

For WIW, I'm using the version with the patched build script actively on my DGX (Gigabyte AI TOP) with no issues. Quite a few less now in fact, it has such high VRAM, I was dealing with memory issues when plenty of memory was available before implementing it.