fix(runtime,hands): 4项根因修复 — URL编码/Browser桩/定时解析/LLM超时

1. researcher.rs: url_encode() chars→bytes，修复中文搜索URL编码
   (U+533B→%533B 改为 UTF-8 %E5%8C%BB)
2. browser.rs: WebDriver不可用时返回明确错误而非静默成功，
   防止LLM误以为操作已完成
3. nl_schedule.rs: 新增相对延迟解析(秒后/分钟后/小时后)，
   避免fallback到LLM幻觉cron
4. 4个LLM driver: 移除http1_only()防reqwest解码错误，
   超时120s→300s适配工具调用链，Anthropic裸Client::new()补全配置

crates/zclaw-runtime/src/driver/gemini.rs

@@ -30,8 +30,7 @@ impl GeminiDriver {
         Self {
             client: Client::builder()
                 .user_agent(crate::USER_AGENT)
-                .http1_only()
-                .timeout(std::time::Duration::from_secs(120))
+                .timeout(std::time::Duration::from_secs(300))
                 .connect_timeout(std::time::Duration::from_secs(30))
                 .build()
                 .unwrap_or_else(|_| Client::new()),
@@ -44,8 +43,7 @@ impl GeminiDriver {
         Self {
             client: Client::builder()
                 .user_agent(crate::USER_AGENT)
-                .http1_only()
-                .timeout(std::time::Duration::from_secs(120))
+                .timeout(std::time::Duration::from_secs(300))
                 .connect_timeout(std::time::Duration::from_secs(30))
                 .build()
                 .unwrap_or_else(|_| Client::new()),