新增: http_request AI工具(结构化HTTP·SSRF防御·High审批)

- 后端: Cargo.toml reqwest0.12(json/gzip/brotli native-tls对齐df-ai) + http.rs(handler+SSRF三层防御 validate_url/resolve_and_check/重定向≤3跳每跳校验) + tool_registry register_http_tools + 基线28→29
- 前端: useToolCard formatHttpResult + ToolCard渲染(method/url/status/body折叠/截断) + HIGH_RISK_TOOLS + confirmHighHttp + i18n
- SSRF: localhost/私有IP(127/10/172.16/192.168/169.254云元数据/100.64CGNAT/≥224/IPv6保留)拒绝 + DNS resolve校验防重绑定 + 重定向每跳重校验
- 审批: High(统一保守 GET也审批 防漏写操作)
- 截断: 响应50KB(T-05)+ 请求1MB + 超时1-60s默认30

src-tauri/src/commands/ai/mod.rs

@@ -27,6 +27,7 @@ pub mod audit;
 pub mod commands;
 pub mod compress;
 pub mod conversation;
+pub mod http;
 pub mod knowledge_inject;
 pub mod prompt;
 pub mod provider_pool;