scaffold crates/api-integration similar to crates/api-subscription with nango dep

[devin-ai-integration]

scaffold crates/api-integration with nango dependency

Summary

Scaffolds a new crates/api-integration crate following the same structure as crates/api-subscription, but using hypr-nango (Nango client) as the core dependency instead of Stripe.

Modules added:

• config.rs — IntegrationConfig with nango_api_base, nango_api_key, optional auth
• env.rs — Env struct for deserializing environment config
• error.rs — IntegrationError enum with From impls for nango/auth errors, IntoResponse
• state.rs — AppState holding config + NangoClient
• routes/connect.rs — POST /connect-session endpoint (creates a Nango connect session)
• routes/mod.rs — router + OpenAPI doc generation

Registered as hypr-api-integration in workspace Cargo.toml.

Review & Testing Checklist for Human

• Verify the scaffolded module structure and public API match your expectations (e.g. does AppState::new returning Result instead of Self work for your wiring code?)
• allowed_integrations: vec![] is hardcoded empty in connect.rs:L53 — confirm whether this should be parameterized or populated from config
• reqwest, tokio, serde_json are declared as deps but unused in current source — decide if you want to keep them for future use or trim

Notes

• Compiled successfully with cargo check -p api-integration
• Formatted with dprint fmt
• Based on the recently-refactored nango crate (post-PR refactor(nango): split into modules and add missing proxy methods #3702), which changed NangoClientBuilder::build() to return Result

Link to Devin run · Requested by @yujonglee

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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.

View in Devin Review to see 4 additional findings.