desloppify: code health overhaul plus abuse hardening (140 green, strict 87.2)

Honest baseline after removing 45 gaming suppressions. Structural: lib/game plus root hooks extraction, CORS origin echo, DEV_ORIGINS layering. Fixes: error-cause binding, discord 5xx split, null-cache guard, co-located tests, rejecting-fetch coverage, naming and typing cleanup, socket controller, cache bound, cascade helpers, latch resets. Hardening: per-IP rate limit on API routes, deterministic-miss UX, retry cooldown plus cap. Suite 140 green, build plus lint clean.

lib/i18n/get-dictionary.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from "vitest";
+import { getDictionary } from "@/lib/i18n/get-dictionary";
+import { DEFAULT_LOCALE, matchLocale, type Locale } from "@/lib/i18n/locales";
+
+describe("getDictionary", () => {
+    it("returns the requested locale", () => {
+        expect(getDictionary("de").discord.gameProfile).toBe("Spielprofil");
+    });
+
+    it("falls back to Turkish for unknown locales", () => {
+        expect(getDictionary(matchLocale("fr"))).toEqual(getDictionary("tr"));
+    });
+
+    it("keeps all locales structurally in sync", () => {
+        const shape = (locale: Locale): string => JSON.stringify(getDictionary(locale));
+        expect(Object.keys(JSON.parse(shape("en"))).sort()).toEqual(
+            Object.keys(JSON.parse(shape("tr"))).sort(),
+        );
+        expect(Object.keys(JSON.parse(shape("de"))).sort()).toEqual(
+            Object.keys(JSON.parse(shape("tr"))).sort(),
+        );
+    });
+
+    it("defaults to Turkish", () => {
+        expect(DEFAULT_LOCALE).toBe("tr");
+    });
+});