fix(api): replace raw error responses with generic ErrInternalServerError

[rohilsurana]

Summary

• 21 call sites across 6 handler files were returning raw internal errors to clients via connect.NewError(connect.CodeInternal, err), leaking DB table names, OIDC config, SMTP details, SpiceDB addresses, and file paths
• Replaced all with connect.NewError(connect.CodeInternal, ErrInternalServerError) which returns a generic "internal server error" message
• All call sites already had errorLogger.LogUnexpectedError / errorLogger.LogServiceError calls logging the real error server-side before returning

Files changed

• authenticate.go — 10 fixes (unauthenticated endpoints, highest risk)
• authorize.go — 2 fixes
• kyc.go — 3 fixes
• organization.go — 2 fixes
• role.go — 2 fixes
• serviceuser.go — 2 fixes

Test plan

• go build and go vet pass
• Zero remaining connect.NewError(connect.CodeInternal, err) in handler files
• Verify error responses return generic message, not raw error details

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Project	Deployment	Actions	Updated (UTC)
frontier	Ready	Preview, Comment	May 15, 2026 1:19pm

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📥 Commits

Reviewing files that changed from the base of the PR and between c922ba4 and 9b151a9.

📒 Files selected for processing (6)

• internal/api/v1beta1connect/authenticate.go
• internal/api/v1beta1connect/authorize.go
• internal/api/v1beta1connect/kyc.go
• internal/api/v1beta1connect/organization.go
• internal/api/v1beta1connect/role.go
• internal/api/v1beta1connect/serviceuser.go

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