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-tauri/Cargo.toml

@@ -17,6 +17,9 @@ tauri-build = { version = "2", features = [] }
 
 [features]
 default = []
+# Multi-agent orchestration (A2A protocol, Director, agent delegation)
+# Disabled by default — enable when multi-agent UI is ready.
+multi-agent = ["zclaw-kernel/multi-agent"]
 dev-server = ["dep:axum", "dep:tower-http"]
 
 [dependencies]
@@ -24,7 +27,7 @@ dev-server = ["dep:axum", "dep:tower-http"]
 zclaw-types = { workspace = true }
 zclaw-memory = { workspace = true }
 zclaw-runtime = { workspace = true }
-zclaw-kernel = { workspace = true, features = ["multi-agent"] }
+zclaw-kernel = { workspace = true }
 zclaw-skills = { workspace = true }
 zclaw-hands = { workspace = true }
 zclaw-pipeline = { workspace = true }