feat(arayüz): API istemcisi, TanStack Query, ts-rs tip üretimi ve oturum durumu

- Backend: ts-rs ile DTO'lardan TypeScript tipleri (frontend/src/types, npm run types)
- Hata ve health yanıtları tipli yapılara çevrildi
- lib/api.ts: tek API istemcisi, Türkçe ApiError, ağ hatası mesajı
- lib/query.ts: QueryClient (4xx tekrar denenmez, 401 → oturum kapanır)
- lib/auth.ts: useMe, useLogin, useRegister, useLogout
- Vitest: 7 API istemcisi testi (toplam 29)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/src/routes/catalog.rs

@@ -16,6 +16,7 @@ use axum::{
 };
 use mongodb::bson::Uuid;
 use serde::{Deserialize, Serialize};
+use ts_rs::TS;
 use validator::Validate;
 
 use crate::{
@@ -35,7 +36,8 @@ pub struct ListQuery {
     include_inactive: bool,
 }
 
-#[derive(Deserialize, Validate)]
+#[derive(Deserialize, Validate, TS)]
+#[ts(export, rename = "CatalogCreateRequest", optional_fields)]
 pub struct CreateRequest {
     group: Option<Group>,
     #[validate(length(max = 40, message = "Ad en fazla 40 karakter olabilir"))]
@@ -44,7 +46,8 @@ pub struct CreateRequest {
     emoji: Option<String>,
 }
 
-#[derive(Deserialize, Validate)]
+#[derive(Deserialize, Validate, TS)]
+#[ts(export, rename = "CatalogUpdateRequest", optional_fields)]
 pub struct UpdateRequest {
     #[validate(length(max = 40, message = "Ad en fazla 40 karakter olabilir"))]
     name: Option<String>,
@@ -54,17 +57,20 @@ pub struct UpdateRequest {
     version: Option<i32>,
 }
 
-#[derive(Deserialize, Validate)]
+#[derive(Deserialize, Validate, TS)]
+#[ts(export, rename = "CatalogOrderRequest", optional_fields)]
 pub struct OrderRequest {
     group: Option<Group>,
     #[validate(length(max = 200, message = "Liste çok uzun"))]
     ids: Vec<String>,
 }
 
-#[derive(Serialize)]
+#[derive(Serialize, TS)]
+#[ts(export, rename = "CatalogItem")]
 pub struct ItemDto {
     id: String,
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[ts(optional)]
     group: Option<Group>,
     name: String,
     emoji: Option<String>,