scaffold minimal crates/api-sync

[devin-ai-integration]

Summary

Scaffolds a minimal crates/api-sync crate, mirroring the structure of crates/api-subscription with utoipa (OpenAPI) support. The crate is registered in the workspace Cargo.toml.

Files added:

• Cargo.toml — workspace deps (axum, utoipa, serde, thiserror, etc.), no Stripe deps
• src/lib.rs — module declarations and public re-exports
• src/config.rs — SyncConfig with supabase URL/key and optional auth
• src/error.rs — SyncError enum (Auth, BadRequest, Internal) with axum IntoResponse
• src/state.rs — AppState wrapping SyncConfig
• src/routes/mod.rs — empty utoipa OpenApi derive, empty router(), openapi() fn

Review & Testing Checklist for Human

• Verify the crate compiles (cargo check -p api-sync) — I was unable to verify locally due to a pre-existing plugins/cli2 workspace issue (missing Cargo.toml)
• Confirm the dependency set in Cargo.toml is appropriate — reqwest, tokio, serde_json are included but unused currently; remove if you prefer no dead-dep warnings
• Check that the scaffolding matches your intended starting point for sync functionality

Notes

• Requested by @yujonglee
• Devin run

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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