feat(inventory): add CPU arch reporting and SDL arch attribute support

[chainzero]

📝 Description

Covers inventory CPU arch reporting, bid engine filtering, and SDL arch attribute support

🔧 Purpose of the Change

• [ X] New feature implementation
• Bug fix
• Documentation update
• Code refactoring
• Dependency upgrade
• Other: [specify]

📌 Related Issues

• Closes #ISSUE_NUMBER
• References #ISSUE_NUMBER

✅ Checklist

• [ X] I've updated relevant documentation
• [ X] Code follows Akash Network's style guide
• [ X] I've added/updated relevant unit tests
• [ X] Dependencies have been properly updated
• [ X] I agree and adhered to the Contribution Guidelines

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR adds an arch field to CPU inventory data, preserves it during duplication, and adds YAML unmarshalling for CPU resources with a test covering input that omits arch.

Changes

CPU arch propagation

Layer / File(s)	Summary
Schema and duplication proto/provider/akash/inventory/v1/cpu.proto, go/inventory/v1/cpu.go	CPUInfo adds arch, and CPUInfoS.Dup() copies Arch into each duplicated item.
YAML decoding and test go/sdl/cpu.go, go/sdl/cpu_test.go	v2ResourceCPU.UnmarshalYAML decodes units and attributes, rejects unsupported fields, and the new test covers YAML without arch.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A bunny hopped through CPU fields bright,
with arch tucked in just right.
I nibbled YAML, clean and neat,
and copied dupes without a leak.
🐇🥕

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description follows the template and covers the change, purpose, checklist, and issue references, though some fields remain placeholders.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: CPU architecture reporting plus SDL CPU arch attribute support.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/cpu-arch-inventory

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@go/sdl/cpu.go`:
- Around line 19-38: In v2ResourceCPU.UnmarshalYAML, validate that the incoming
yaml.Node is a mapping before iterating node.Content; currently scalar or
sequence nodes fall through and return an empty v2ResourceCPU without error. Add
an early node.Kind check in UnmarshalYAML and return a clear error for
non-mapping CPU resources, then keep the existing field decoding logic for units
and attributes unchanged.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: f02118f0-e2f0-4126-b412-4b1dcd49212d

📥 Commits

Reviewing files that changed from the base of the PR and between cbe61a5 and 70049ca.

⛔ Files ignored due to path filters (1)

• go/inventory/v1/cpu.pb.go is excluded by !**/*.pb.go

📒 Files selected for processing (4)

• go/inventory/v1/cpu.go
• go/sdl/cpu.go
• go/sdl/cpu_test.go
• proto/provider/akash/inventory/v1/cpu.proto