feat: Batch 5-9 — GrowthIntegration桥接、验证补全、死代码清理、Pipeline模板、Speech/Twitter真实实现

Batch 5 (P0): GrowthIntegration 接入 Tauri
- Kernel 新增 set_viking()/set_extraction_driver() 桥接 SqliteStorage
- 中间件链共享存储，MemoryExtractor 接入 LLM 驱动

Batch 6 (P1): 输入验证 + Heartbeat
- Relay 验证补全（stream 兼容检查、API key 格式校验）
- UUID 类型校验、SessionId 错误返回
- Heartbeat 默认开启 + 首次聊天自动初始化

Batch 7 (P2): 死代码清理
- zclaw-channels 整体移除（317 行）
- multi-agent 特性门控、admin 方法标注

Batch 8 (P2): Pipeline 模板
- PipelineMetadata 新增 annotations 字段
- pipeline_templates 命令 + 2 个示例模板
- fallback driver base_url 修复（doubao/qwen/deepseek 端点）

Batch 9 (P1): SpeechHand/TwitterHand 真实实现
- SpeechHand: tts_method 字段 + Browser TTS 前端集成 (Web Speech API)
- TwitterHand: 12 个 action 全部替换为 Twitter API v2 真实 HTTP 调用
- chatStore/useAutomationEvents 双路径 TTS 触发

desktop/src/store/chatStore.ts

@@ -8,6 +8,7 @@ import { getSkillDiscovery } from '../lib/skill-discovery';
 import { useOfflineStore, isOffline } from './offlineStore';
 import { useConnectionStore } from './connectionStore';
 import { createLogger } from '../lib/logger';
+import { speechSynth } from '../lib/speech-synth';
 import { generateRandomString } from '../lib/crypto-utils';
 
 const log = createLogger('ChatStore');
@@ -461,6 +462,24 @@ export const useChatStore = create<ChatState>()(
               handResult: result,
             };
             set((state) => ({ messages: [...state.messages, handMsg] }));
+
+            // Trigger browser TTS when SpeechHand completes with browser method
+            if (name === 'speech' && status === 'completed' && result && typeof result === 'object') {
+              const res = result as Record<string, unknown>;
+              if (res.tts_method === 'browser' && typeof res.text === 'string' && res.text) {
+                speechSynth.speak({
+                  text: res.text as string,
+                  voice: (res.voice as string) || undefined,
+                  language: (res.language as string) || undefined,
+                  rate: typeof res.rate === 'number' ? res.rate : undefined,
+                  pitch: typeof res.pitch === 'number' ? res.pitch : undefined,
+                  volume: typeof res.volume === 'number' ? res.volume : undefined,
+                }).catch((err: unknown) => {
+                  const logger = createLogger('speech-synth');
+                  logger.warn('Browser TTS failed', { error: String(err) });
+                });
+              }
+            }
           },
           onComplete: (inputTokens?: number, outputTokens?: number) => {
             const state = get();