Feat/OIDC discovery

[TharunvenkateshN]

Description

Closes #170

This PR introduces the OpenID Connect (OIDC) Discovery Endpoint to allow standard OIDC clients (like NextAuth or Auth0 SDKs) to automatically configure authorization endpoints, token endpoints, and supported scopes without manual setup.

Note: This PR is based on the JWKS PR, as it relies on exposing the JWKS URI.

Changes Made

• OIDC DTO: Created OIDCDiscoveryResponse struct in internal/dto/oidc_discovery.go to map OIDC configuration fields.
• Discovery Handler: Added internal/handler/oidc_discovery_handler.go which dynamically constructs absolute URLs for the Authorization, Token, UserInfo, and JWKS endpoints based on the active server's base URL (cfg.App.URL).
• Route Registration: Exposed the OIDC discovery metadata payload at GET /.well-known/openid-configuration.

How to Test

1. Start the server.
2. Navigate to http://localhost:3000/.well-known/openid-configuration.
3. Verify that the JSON response is standards-compliant and correctly points to the active server's absolute URL for all endpoints.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: be4c30e2-a163-4944-bfa4-277480d18b14

📥 Commits

Reviewing files that changed from the base of the PR and between f5d1fcf and a9ad0ba.

📒 Files selected for processing (17)

• docs/docs.go
• docs/swagger.json
• docs/swagger.yaml
• internal/config/config.go
• internal/dto/jwks.go
• internal/dto/oidc_discovery.go
• internal/handler/auth_handler_protected_test.go
• internal/handler/auth_handler_test.go
• internal/handler/jwks_handler.go
• internal/handler/oauth_handler_test.go
• internal/handler/oidc_discovery_handler.go
• internal/middleware/auth_test.go
• internal/routes/routes.go
• internal/service/security_phase1_test.go
• internal/service/token_service.go
• internal/service/token_service_test.go
• internal/testutils/setup.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[TharunvenkateshN]

I have read the CLA and agree to its terms.