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/game/steam.ts

@@ -0,0 +1,58 @@
+import type {
+    GameReviewSummary,
+    SteamAppDetails,
+    SteamReviewQuery,
+} from "@/lib/game/game-profile-types";
+import { resolveGameLocale } from "@/lib/game/game-format";
+import { warnDev } from "@/lib/log";
+
+export async function getSteamDetails(
+    steamId: string,
+    lang = "en",
+    country = "US",
+): Promise<SteamAppDetails["data"] | null> {
+    try {
+        const { steamLang } = resolveGameLocale(lang);
+        const response = await fetch(
+            `https://store.steampowered.com/api/appdetails?appids=${steamId}&l=${steamLang}&cc=${country}`,
+            { next: { revalidate: 86_400 } },
+        );
+        if (!response.ok) {
+            warnDev(`steam details failed: ${response.status}`);
+            return null;
+        }
+        const json = (await response.json()) as Record<string, SteamAppDetails>;
+        const entry = json[steamId];
+        return entry?.success ? (entry.data ?? null) : null;
+    } catch (error) {
+        warnDev(`steam details request failed: ${error instanceof Error ? error.message : error}`);
+        return null;
+    }
+}
+export async function getSteamReviewSummary(steamId: string): Promise<GameReviewSummary | null> {
+    try {
+        const url =
+            `https://store.steampowered.com/appreviews/${steamId}` +
+            "?json=1&language=all&purchase_type=all&num_per_page=0";
+        const response = await fetch(url, { next: { revalidate: 3600 } });
+        if (!response.ok) {
+            warnDev(`steam reviews failed: ${response.status}`);
+            return null;
+        }
+        const json = (await response.json()) as { query_summary?: SteamReviewQuery };
+        const summary = json.query_summary;
+        if (!summary || typeof summary.total_reviews !== "number") {
+            return null;
+        }
+        return {
+            label: summary.review_score_desc ?? "",
+            total: summary.total_reviews,
+            positive: summary.total_positive ?? null,
+            negative: summary.total_negative ?? null,
+            url: `https://store.steampowered.com/app/${steamId}/#app_reviews_hash`,
+        };
+    } catch (error) {
+        warnDev(`steam reviews request failed: ${error instanceof Error ? error.message : error}`);
+        return null;
+    }
+}