chore: clean up api, add user support

Signed-off-by: Alan Brault <alan.brault@visus.io>

src/main/kotlin/io/visus/demos/kotlinapi/seed/DataSeeder.kt

@@ -0,0 +1,54 @@
+package io.visus.demos.kotlinapi.seed
+
+import io.visus.demos.kotlinapi.domain.model.User
+import io.visus.demos.kotlinapi.infrastructure.user.UserRepository
+import org.springframework.boot.ApplicationArguments
+import org.springframework.boot.ApplicationRunner
+import org.springframework.security.crypto.password.PasswordEncoder
+import org.springframework.stereotype.Component
+
+@Component
+class DataSeeder(
+    private val userRepository: UserRepository,
+    private val passwordEncoder: PasswordEncoder,
+) : ApplicationRunner {
+    override fun run(args: ApplicationArguments) {
+        seedUser(
+            email = "user@example.com",
+            rawPassword = "user12345",
+            role = "ROLE_USER",
+        )
+
+        seedUser(
+            email = "admin@example.com",
+            rawPassword = "admin12345",
+            role = "ROLE_ADMIN",
+        )
+    }
+
+    private fun seedUser(
+        email: String,
+        rawPassword: String,
+        role: String,
+    ) {
+        if (userRepository.findByEmail(email) != null) {
+            println("User '$email' already exists — skipping.")
+            return
+        }
+
+        val hashedPassword =
+            passwordEncoder.encode(rawPassword)
+                ?: error("Password encoding returned null")
+
+        val user =
+            User(
+                email = email,
+                passwordHash = hashedPassword,
+                role = role,
+            )
+
+        val saved = userRepository.save(user)
+        val savedId = saved.id ?: "unknown"
+        println("Seeded user '${saved.email}' with id=$savedId and role=${saved.role}")
+    }
+}