fix: add visible startup progress logs to lifespan

- Added logger.info() calls before each startup step (encryption key,
  Alembic, init_db, admin bootstrap, scheduler, app complete)
- Previously only logger.reason() was used which logs at DEBUG level
  and is invisible in production/development at INFO log level
- This fixes 'no backend logs visible' when running via ./run.sh

backend/src/app.py

@@ -75,12 +75,18 @@ async def lifespan(app: FastAPI):
     # Startup
     seed_trace_id()
     with belief_scope("startup_event"):
+        logger.info("🔐 Ensuring encryption key...")
         ensure_encryption_key()
+        logger.info("📦 Running Alembic migrations...")
         run_alembic_migrations()
+        logger.info("🗄️ Initializing database tables...")
         init_db()
+        logger.info("👤 Bootstrapping admin user...")
         ensure_initial_admin_user()
+        logger.info("⏰ Starting scheduler...")
         scheduler = get_scheduler_service()
     scheduler.start()
+    logger.info("✅ Application startup complete")
     yield
     # Shutdown
     scheduler.stop()