refactor(src): split oversized modules

src/config/types.auth.ts

@@ -0,0 +1,29 @@
+export type AuthProfileConfig = {
+  provider: string;
+  /**
+   * Credential type expected in auth-profiles.json for this profile id.
+   * - api_key: static provider API key
+   * - oauth: refreshable OAuth credentials (access+refresh+expires)
+   * - token: static bearer-style token (optionally expiring; no refresh)
+   */
+  mode: "api_key" | "oauth" | "token";
+  email?: string;
+};
+
+export type AuthConfig = {
+  profiles?: Record<string, AuthProfileConfig>;
+  order?: Record<string, string[]>;
+  cooldowns?: {
+    /** Default billing backoff (hours). Default: 5. */
+    billingBackoffHours?: number;
+    /** Optional per-provider billing backoff (hours). */
+    billingBackoffHoursByProvider?: Record<string, number>;
+    /** Billing backoff cap (hours). Default: 24. */
+    billingMaxHours?: number;
+    /**
+     * Failure window for backoff counters (hours). If no failures occur within
+     * this window, counters reset. Default: 24.
+     */
+    failureWindowHours?: number;
+  };
+};