feat(sdk): add gateway, auth, fakes, and edge client (2/4)

[rhuss]

Summary

Add the gateway client (reads CLI config), OIDC authentication with token refresh, edge/tunnel client, and in-memory fake implementations for testing.

Part 2 of 4 for #2044. Depends on PR 1 (foundation).

What's Included

• Gateway client (gateway/): Reads ~/.config/openshell/ config, resolves auth automatically
• OIDC authentication (oidc/): Discovery, device-code flow, auth-code flow, token management
• Edge client (edge/): Cloudflare tunnel integration for edge API access
• Fake implementations (fake/): In-memory fakes mirroring real client validation for testing

File Tree

sdk/go/openshell/v1/
├── gateway/     # 12 files - Gateway client factory + config reader
├── oidc/        # 22 files - OIDC authentication flows
├── edge/        #  5 files - Edge API + tunnel proxy
└── fake/        # 31 files - In-memory test fakes

70 files

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