Merge remote-tracking branch 'origin/master' into gitea/feature/end

Resolved conflicts taking origin/master (v0.5.55) as canonical, with local
features re-applied:
- runtime log level (LOG_LEVEL env + dashboard Settings → Logging, applied
  immediately and persisted across restarts)
- free/noAuth provider enable/disable toggle via providerStrategies.enabled
- parallel model testing (Test All Models / Test Selected Keys)

open-sse/services/usage/deepseek.js

@@ -0,0 +1,112 @@
+/**
+ * DeepSeek usage — GET https://api.deepseek.com/user/balance
+ * Auth: Bearer <apiKey>
+ */
+
+import { proxyAwareFetch } from "../../utils/proxyFetch.js";
+import { toFiniteNumber } from "./shared.js";
+
+const BALANCE_URL = "https://api.deepseek.com/user/balance";
+
+function parseBalanceInfos(data) {
+  const list = Array.isArray(data?.balance_infos) ? data.balance_infos : [];
+  const results = [];
+  for (const item of list) {
+    if (!item || typeof item !== "object") continue;
+    const currency =
+      typeof item.currency === "string" ? item.currency.toUpperCase() : "";
+    if (!currency) continue;
+    const totalBalance = toFiniteNumber(
+      item.total_balance ?? item.totalBalance,
+      0,
+    );
+    results.push({
+      currency,
+      totalBalance,
+      grantedBalance: toFiniteNumber(
+        item.granted_balance ?? item.grantedBalance,
+        0,
+      ),
+      toppedUpBalance: toFiniteNumber(
+        item.topped_up_balance ?? item.toppedUpBalance,
+        0,
+      ),
+    });
+  }
+  return results;
+}
+
+/**
+ * @param {string|null|undefined} apiKey
+ * @param {object|null} proxyOptions
+ */
+export async function getDeepseekUsage(apiKey = null, proxyOptions = null) {
+  if (!apiKey || typeof apiKey !== "string" || !apiKey.trim()) {
+    return { message: "DeepSeek API key not available. Add a key to view usage." };
+  }
+
+  try {
+    const response = await proxyAwareFetch(
+      BALANCE_URL,
+      {
+        method: "GET",
+        headers: {
+          Authorization: `Bearer ${apiKey.trim()}`,
+          "Content-Type": "application/json",
+          Accept: "application/json",
+        },
+      },
+      proxyOptions,
+    );
+
+    if (response.status === 401 || response.status === 403) {
+      return {
+        plan: "DeepSeek",
+        message: "DeepSeek authentication failed. Check the API key.",
+      };
+    }
+
+    if (!response.ok) {
+      const errText = await response.text().catch(() => "");
+      return {
+        plan: "DeepSeek",
+        message: `DeepSeek balance API error (${response.status})${errText ? `: ${errText.slice(0, 120)}` : ""}`,
+      };
+    }
+
+    const data = await response.json().catch(() => null);
+    if (!data || typeof data !== "object") {
+      return { message: "DeepSeek balance response was not JSON." };
+    }
+
+    const balances = parseBalanceInfos(data);
+    if (balances.length === 0) {
+      return {
+        plan: "DeepSeek",
+        message: "DeepSeek connected. No balance data returned.",
+      };
+    }
+
+    const isAvailable = data.is_available === true || data.isAvailable === true;
+    const quotas = {};
+    for (const b of balances) {
+      const total = Math.max(0, b.totalBalance);
+      // Credit pot: show full remaining against current balance; never set absolute
+      // `remaining` — QuotaTable treats it as a 0–100 percentage.
+      quotas[`Balance (${b.currency})`] = {
+        used: 0,
+        total,
+        remainingPercentage: total > 0 ? 100 : 0,
+        resetAt: null,
+        unlimited: total > 0,
+      };
+    }
+
+    return {
+      plan: isAvailable ? "DeepSeek" : "DeepSeek (Insufficient Balance)",
+      quotas,
+    };
+  } catch (error) {
+    return { message: `DeepSeek error: ${error.message}` };
+  }
+}