refactor: remove username from User model, login by email only

tests/unit/schemas/core-schemas.test.ts

@@ -83,7 +83,6 @@ describe("core schemas", () => {
     expect(
       updateUserSchema.safeParse({
         id: "user-id",
-        username: "user",
         name: "User",
         email: "user@example.test",
         role: "ADMIN",
@@ -94,7 +93,6 @@ describe("core schemas", () => {
     expect(
       updateUserSchema.safeParse({
         id: "",
-        username: "user",
         name: "User",
         email: "user@example.test",
         role: "ADMIN",
@@ -110,13 +108,13 @@ describe("core schemas", () => {
     )
 
     expect(
-      signInSchema.safeParse({ username: "admin", password: "abc" }).success,
+      signInSchema.safeParse({ email: "admin@test.com", password: "abc" }).success,
     ).toBe(true)
     expect(
-      signInSchema.safeParse({ username: "", password: "abc" }).success,
+      signInSchema.safeParse({ email: "", password: "abc" }).success,
     ).toBe(false)
     expect(
-      signInSchema.safeParse({ username: "admin", password: "ab" }).success,
+      signInSchema.safeParse({ email: "admin@test.com", password: "ab" }).success,
     ).toBe(false)
   })
 
@@ -152,7 +150,6 @@ describe("core schemas", () => {
   it("validates user password, email, and role", () => {
     expect(
       createUserSchema.safeParse({
-        username: "user",
         name: "User",
         email: "user@example.test",
         password: "password1",
@@ -163,7 +160,6 @@ describe("core schemas", () => {
 
     expect(
       createUserSchema.safeParse({
-        username: "user",
         name: "User",
         email: "bad-email",
         password: "password1",
@@ -174,7 +170,6 @@ describe("core schemas", () => {
 
     expect(
       createUserSchema.safeParse({
-        username: "user",
         name: "User",
         email: "user@example.test",
         password: "short",
@@ -185,7 +180,6 @@ describe("core schemas", () => {
 
     expect(
       createUserSchema.safeParse({
-        username: "user",
         name: "User",
         email: "user@example.test",
         password: "password1",