chore: upgrade Go to 1.26

[sylr]

Summary

• Upgrade Go toolchain from 1.23 to 1.26 in nix dev shell
• Modernize flake.nix to use stable/unstable nixpkgs split
• Use allowUnfreePredicate instead of allowUnfree = true
• Update nix flake lock file

🤖 Generated with Claude Code

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⚙️ Run configuration

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Review profile: CHILL

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Run ID: 9e1f8eb2-eec5-4486-8134-d5d9e41212b0

📥 Commits

Reviewing files that changed from the base of the PR and between 2794752 and 00732b5.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (8)

• flake.nix
• pkg/api/clients_test.go
• pkg/api/users_test.go
• pkg/client_test.go
• pkg/oidc/grant_type_bearer.go
• pkg/oidc/oidc_test.go
• pkg/oidc/storage.go
• pkg/testserver/helpers.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/upgrade-go

📝 Coding Plan

• Generate coding plan for human review comments

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