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

crates/zclaw-hands/src/hands/speech.rs

@@ -233,17 +233,32 @@ impl SpeechHand {
                 state.playback = PlaybackState::Playing;
                 state.current_text = Some(text.clone());
 
-                // In real implementation, would call TTS API
+                // Determine TTS method based on provider:
+                // - Browser: frontend uses Web Speech API (zero deps, works offline)
+                // - OpenAI: frontend calls speech_tts command (high-quality, needs API key)
+                // - Others: future support
+                let tts_method = match state.config.provider {
+                    TtsProvider::Browser => "browser",
+                    TtsProvider::OpenAI => "openai_api",
+                    TtsProvider::Azure => "azure_api",
+                    TtsProvider::ElevenLabs => "elevenlabs_api",
+                    TtsProvider::Local => "local_engine",
+                };
+
+                let estimated_duration_ms = (text.chars().count() as f64 / 5.0 * 1000.0) as u64;
+
                 Ok(HandResult::success(serde_json::json!({
                     "status": "speaking",
+                    "tts_method": tts_method,
                     "text": text,
                     "voice": voice_id,
                     "language": lang,
                     "rate": actual_rate,
                     "pitch": actual_pitch,
                     "volume": actual_volume,
-                    "provider": state.config.provider,
-                    "duration_ms": text.len() as u64 * 80, // Rough estimate
+                    "provider": format!("{:?}", state.config.provider).to_lowercase(),
+                    "duration_ms": estimated_duration_ms,
+                    "instruction": "Frontend should play this via TTS engine"
                 })))
             }
             SpeechAction::SpeakSsml { ssml, voice } => {