feat: xAI image generate/edit, API key import, and per-provider timeouts

- Add dedicated xAI image adapter with generate + edit (multi-image) via
  /v1/images/generations and /v1/images/edits, plus aspect_ratio/resolution UI
- Support importing existing API keys and exposing connection api-key routes
- Add global/per-provider connect timeout overrides from settings
- Keep unrelated provider UX improvements on this branch; no Grok quota tracking

open-sse/services/providerTimeout.js

@@ -0,0 +1,56 @@
+/**
+ * Per-provider connect timeout overrides from user settings.
+ * Settings are read from the DB lazily and cached with a short TTL
+ * so UI changes take effect without requiring a restart.
+ */
+
+let cached = {};
+let cacheTs = 0;
+const CACHE_TTL_MS = 10_000; // 10s — responsive enough for dashboard changes
+
+async function refreshCache() {
+  const now = Date.now();
+  if (now - cacheTs < CACHE_TTL_MS && Object.keys(cached).length > 0) return cached;
+
+  try {
+    const { getSettings } = await import("@/lib/localDb");
+    // Return full settings so we can read providerTimeouts + globalTimeoutMs
+    cached = await getSettings();
+    cacheTs = now;
+  } catch {
+    // If DB is unavailable, keep stale cache — don't throw on hot path
+  }
+  return cached;
+}
+
+/**
+ * Resolve the effective connect timeout for a provider.
+ * Priority: per-provider override > global default timeout (settings) > registry config > env default.
+ * @param {string} providerId
+ * @param {number} configTimeoutMs - timeoutMs from the static provider registry config
+ * @param {number} envDefaultMs - global default from env (FETCH_CONNECT_TIMEOUT_MS)
+ * @returns {number} timeout in milliseconds
+ */
+export async function resolveProviderTimeoutMs(providerId, configTimeoutMs, envDefaultMs) {
+  const overrides = await refreshCache();
+
+  // 1. Per-provider override (set in provider detail page)
+  const providerOverride = overrides.providerTimeouts?.[providerId];
+  if (providerOverride?.timeoutMs && Number.isFinite(providerOverride.timeoutMs) && providerOverride.timeoutMs > 0) {
+    return providerOverride.timeoutMs;
+  }
+
+  // 2. Global default timeout (set in Profile / Settings page)
+  const globalDefault = overrides.defaultTimeoutMs;
+  if (globalDefault && Number.isFinite(globalDefault) && globalDefault > 0) {
+    return globalDefault;
+  }
+
+  // 3. Registry per-provider config
+  if (configTimeoutMs && Number.isFinite(configTimeoutMs) && configTimeoutMs > 0) {
+    return configTimeoutMs;
+  }
+
+  // 4. Env default
+  return envDefaultMs;
+}