feat(openclaw): add agents.defaults config support

- Add types for default model config (primary + fallbacks)
- Add types for model catalog/allowlist with aliases
- Extend OpenClawModelEntry with cost and contextWindow fields
- Add Tauri commands: get/set_openclaw_default_model, get/set_openclaw_model_catalog
- Create frontend API (src/lib/api/openclaw.ts)
- Add suggestedDefaults to provider presets with model metadata
- Add i18n translations (zh/en/ja) for openclawConfig.*

src/lib/api/openclaw.ts

@@ -0,0 +1,59 @@
+import { invoke } from "@tauri-apps/api/core";
+import type {
+  OpenClawDefaultModel,
+  OpenClawModelCatalogEntry,
+} from "@/types";
+
+/**
+ * OpenClaw agents configuration API
+ *
+ * Manages agents.defaults configuration in ~/.openclaw/openclaw.json
+ */
+export const openclawApi = {
+  /**
+   * Get default model configuration (agents.defaults.model)
+   */
+  async getDefaultModel(): Promise<OpenClawDefaultModel | null> {
+    return await invoke("get_openclaw_default_model");
+  },
+
+  /**
+   * Set default model configuration (agents.defaults.model)
+   */
+  async setDefaultModel(model: OpenClawDefaultModel): Promise<void> {
+    return await invoke("set_openclaw_default_model", { model });
+  },
+
+  /**
+   * Get model catalog/allowlist (agents.defaults.models)
+   */
+  async getModelCatalog(): Promise<Record<
+    string,
+    OpenClawModelCatalogEntry
+  > | null> {
+    return await invoke("get_openclaw_model_catalog");
+  },
+
+  /**
+   * Set model catalog/allowlist (agents.defaults.models)
+   */
+  async setModelCatalog(
+    catalog: Record<string, OpenClawModelCatalogEntry>,
+  ): Promise<void> {
+    return await invoke("set_openclaw_model_catalog", { catalog });
+  },
+
+  /**
+   * Import providers from live config (openclaw.json) to database
+   */
+  async importProvidersFromLive(): Promise<number> {
+    return await invoke("import_openclaw_providers_from_live");
+  },
+
+  /**
+   * Get provider IDs that exist in live config (openclaw.json)
+   */
+  async getLiveProviderIds(): Promise<string[]> {
+    return await invoke("get_openclaw_live_provider_ids");
+  },
+};