feat(i18n): improve ai chat and settings localization

app/api/finance-analysis/route.ts

@@ -4,6 +4,8 @@ import { aiJsonError } from "@/server/ai/responses";
 import { domainActorFromSession } from "@/server/auth/domain-actor";
 import { getSessionContextFromHeaders } from "@/server/auth/session";
 import { DomainError } from "@/server/domain/errors";
+import { resolveFreelancerLocale } from "@/server/i18n/resolver";
+import { createTranslator } from "@/server/i18n/translator";
 import { getDomainService } from "@/server/services/runtime";
 import { generateText } from "ai";
 import { NextResponse } from "next/server";
@@ -11,20 +13,24 @@ import { NextResponse } from "next/server";
 export const maxDuration = 120;
 
 export async function POST(request: Request) {
+  let t: ReturnType<typeof createTranslator>["t"] | null = null;
+
   try {
     const context = await getSessionContextFromHeaders(new Headers(request.headers));
     if (!context) {
-      throw new DomainError("UNAUTHENTICATED", "Oturum gerekli.");
+      throw new DomainError("UNAUTHENTICATED", "Authentication is required.");
     }
     if (context.profile.role !== "freelancer") {
-      throw new DomainError("FORBIDDEN", "Bu işlem yalnızca freelancer hesabına açıktır.");
+      throw new DomainError("FORBIDDEN", "This action is only available to freelancer accounts.");
     }
 
     const actor = domainActorFromSession(context);
+    const locale = await resolveFreelancerLocale(context);
+    t = createTranslator(locale.locale, ["finance", "common"]).t;
     const analysisContext = buildFinanceAnalysisContext(getDomainService(), actor);
     if (!analysisContext.hasData) {
       return NextResponse.json({
-        text: "Son 30 güne ait finansal işlem bulunmadığı için analiz yapamıyorum. Lütfen yeni gelir veya gider ekleyin.",
+        text: t("finance.ai.noData"),
       });
     }
 
@@ -32,14 +38,12 @@ export async function POST(request: Request) {
     const { text } = await generateText({
       model: runtime.model,
       timeout: runtime.timeout,
-      system: `Sen profesyonel bir finans danışmanısın.
-Verilen finansal verilere dayanarak kısa, motive edici ve yapıcı bir finansal durum raporu sun.
-Markdown başlıklar kullan, Türkçe konuş ve hukuki ya da finansal kesin hüküm verme.`,
-      prompt: `Aşağıdaki server-side finans özetine göre durum ve uygulanabilir öneriler sun:\n\n${analysisContext.text}`,
+      system: t("finance.ai.systemPrompt"),
+      prompt: t("finance.ai.prompt", { context: analysisContext.text }),
     });
 
     return NextResponse.json({ text });
   } catch (error) {
-    return aiJsonError(error);
+    return aiJsonError(error, t ?? undefined);
   }
 }