refactor(phase-10): complete type safety enhancement

- Add types/api-responses.ts with ApiResponse<T>, PaginatedResponse<T>
- Add types/errors.ts with comprehensive error type hierarchy
- Replace all any usage (53 → 0, 100% reduction)
- Add RawAPI response interfaces for type-safe mapping
- Update catch blocks to use unknown with type narrowing
- Add getState mock to chatStore tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/components/RightPanel.tsx

@@ -1,7 +1,7 @@
 import { useEffect, useMemo, useState } from 'react';
 import { motion } from 'framer-motion';
 import { getStoredGatewayUrl } from '../lib/gateway-client';
-import { useGatewayStore } from '../store/gatewayStore';
+import { useGatewayStore, type PluginStatus } from '../store/gatewayStore';
 import { toChatAgent, useChatStore } from '../store/chatStore';
 import {
   Wifi, WifiOff, Bot, BarChart3, Plug, RefreshCw,
@@ -533,7 +533,7 @@ export function RightPanel() {
               插件 ({pluginStatus.length})
             </h3>
             <div className="space-y-1 text-xs">
-              {pluginStatus.map((p: any, i: number) => (
+              {pluginStatus.map((p: PluginStatus, i: number) => (
                 <div key={i} className="flex justify-between">
                   <span className="text-gray-600 truncate">{p.name || p.id}</span>
                   <span className={p.status === 'active' ? 'text-green-600' : 'text-gray-500'}>