feat: migrate imphnen-backend-hackathon into workspace as imphnen-hackathon crate

Consolidates the standalone hackathon backend (16 crates) into a single
imphnen-hackathon crate following the existing clean architecture patterns.
All endpoints are exposed under /v1/hackathon/ via the gateway.

Features migrated:
- Auth: Supabase-based signup/login/GitHub OAuth/password reset (own JWT)
- Users: profile management with team listing
- Teams: CRUD with city validation, deadline enforcement, invite system
- Invitations: team member invitations with accept/reject flow
- Join Requests: team join request workflow
- Chat: team messaging with author/leader delete permissions
- Submissions: project submission lifecycle (draft→pending→submitted)
- Storage: Supabase Storage file upload endpoints
- Certificates: public user certificate data endpoint
- Winners: public winners listing
- Admin: admin-only CRUD for all entities

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

imphnen-hackathon/src/lib.rs

@@ -0,0 +1,56 @@
+pub mod config;
+pub mod common;
+pub mod middleware;
+pub mod admin;
+pub mod auth;
+pub mod certificates;
+pub mod chat;
+pub mod storage;
+pub mod submissions;
+pub mod teams;
+pub mod users;
+pub mod invitations;
+pub mod join_requests;
+pub mod winners;
+
+pub use admin::hackathon_admin_routes;
+pub use auth::hackathon_auth_routes;
+pub use certificates::hackathon_certificates_routes;
+pub use chat::build_chat_routes;
+pub use storage::hackathon_storage_routes;
+pub use submissions::hackathon_submissions_routes;
+pub use teams::build_team_routes;
+pub use users::hackathon_users_routes;
+pub use invitations::build_invitation_routes;
+pub use join_requests::build_join_request_routes;
+pub use winners::hackathon_winners_routes;
+pub use config::HackathonConfig;
+
+use axum::Router;
+use sea_orm::DatabaseConnection;
+use std::sync::Arc;
+use common::{hackathon_jwt::HackathonJwtService, supabase_client::SupabaseClient};
+
+pub fn hackathon_router(db: DatabaseConnection, config: Arc<HackathonConfig>) -> Router {
+    let pool = Arc::new(db.get_postgres_connection_pool().clone());
+    let jwt = Arc::new(HackathonJwtService::new(&config.jwt_secret, config.jwt_expiry_hours));
+    let supabase = Arc::new(SupabaseClient::new(
+        config.supabase_url.clone(),
+        config.supabase_anon_key.clone(),
+        config.supabase_service_role_key.clone(),
+        config.storage_bucket.clone(),
+    ));
+
+    Router::new()
+        .merge(hackathon_auth_routes(pool.clone(), jwt.clone(), supabase.clone(), config.clone()))
+        .merge(hackathon_users_routes(pool.clone(), jwt.clone()))
+        .merge(build_team_routes(pool.clone(), jwt.clone()))
+        .merge(build_invitation_routes(pool.clone(), jwt.clone()))
+        .merge(build_join_request_routes(pool.clone(), jwt.clone()))
+        .merge(build_chat_routes(pool.clone(), jwt.clone()))
+        .merge(hackathon_submissions_routes(pool.clone(), jwt.clone()))
+        .merge(hackathon_storage_routes(pool.clone(), jwt.clone(), supabase))
+        .merge(hackathon_certificates_routes(pool.clone()))
+        .merge(hackathon_winners_routes(pool.clone()))
+        .merge(hackathon_admin_routes(pool, jwt))
+}