feat: add Hermes frontend types, API layer, and hooks (Phase 7)

- Add "hermes" to AppId union type and all exhaustive Record<AppId>
- Add HermesModelConfig, HermesAgentConfig, HermesEnvConfig types
- Add hermes field to VisibleApps, McpApps, ProxyTakeoverStatus
- Create src/lib/api/hermes.ts with Tauri invoke wrappers
- Create src/hooks/useHermes.ts with 5 query + 3 mutation hooks
- Register hermes in APP_IDS, APP_ICON_MAP (violet color scheme)
- Split MCP_SKILLS_APP_IDS into MCP_APP_IDS (includes hermes) and
  SKILLS_APP_IDS (excludes hermes, since Hermes has no Skills support)
- Wire hermes additive-mode into App.tsx (remove/duplicate handlers),
  ProviderList.tsx (live provider ID query + In Config badge),
  mutations.ts (cache invalidation on switch/add/delete)
- Add Hermes checkbox to McpFormModal
- Add basic hermes i18n keys (en/zh/ja)

src/lib/api/hermes.ts

@@ -0,0 +1,92 @@
+import { invoke } from "@tauri-apps/api/core";
+import type {
+  HermesModelConfig,
+  HermesAgentConfig,
+  HermesEnvConfig,
+  HermesHealthWarning,
+  HermesWriteOutcome,
+} from "@/types";
+
+/**
+ * Hermes Agent configuration API
+ *
+ * Manages Hermes config sections:
+ * - model (model selection and provider)
+ * - agent (agent behavior)
+ * - env (environment variables)
+ */
+export const hermesApi = {
+  // ============================================================
+  // Model Configuration
+  // ============================================================
+
+  /**
+   * Get model configuration
+   */
+  async getModelConfig(): Promise<HermesModelConfig | null> {
+    return await invoke("get_hermes_model_config");
+  },
+
+  /**
+   * Set model configuration
+   */
+  async setModelConfig(config: HermesModelConfig): Promise<HermesWriteOutcome> {
+    return await invoke("set_hermes_model_config", { config });
+  },
+
+  // ============================================================
+  // Agent Configuration
+  // ============================================================
+
+  /**
+   * Get agent configuration
+   */
+  async getAgentConfig(): Promise<HermesAgentConfig | null> {
+    return await invoke("get_hermes_agent_config");
+  },
+
+  /**
+   * Set agent configuration
+   */
+  async setAgentConfig(config: HermesAgentConfig): Promise<HermesWriteOutcome> {
+    return await invoke("set_hermes_agent_config", { config });
+  },
+
+  // ============================================================
+  // Env Configuration
+  // ============================================================
+
+  /**
+   * Get env configuration (.env file)
+   */
+  async getEnv(): Promise<HermesEnvConfig> {
+    return await invoke("get_hermes_env");
+  },
+
+  /**
+   * Set env configuration (.env file)
+   */
+  async setEnv(env: HermesEnvConfig): Promise<HermesWriteOutcome> {
+    return await invoke("set_hermes_env", { env });
+  },
+
+  // ============================================================
+  // Health
+  // ============================================================
+
+  /**
+   * Scan config health and return warnings
+   */
+  async scanHealth(): Promise<HermesHealthWarning[]> {
+    return await invoke("scan_hermes_config_health");
+  },
+
+  /**
+   * Get live provider config by ID
+   */
+  async getLiveProvider(
+    providerId: string,
+  ): Promise<Record<string, unknown> | null> {
+    return await invoke("get_hermes_live_provider", { providerId });
+  },
+};