完善 Rust SDK：中文化文档和注释，添加多个测试示例

- 翻译所有文档和注释为中文（README.md, CHANGELOG.md, API文档等）
- 修复 reqwest TLS 支持问题，添加 rustls-tls 功能
- 新增5个测试示例：
  * health_check.rs - 基础健康检查
  * llm_chat_test.rs - LLM聊天功能测试
  * midjourney_image_test.rs - Midjourney图像生成测试
  * file_upload_test.rs - 文件上传和媒体分析测试
  * comprehensive_test.rs - 综合功能测试
- 添加测试脚本（PowerShell和Bash版本）
- 验证API功能正常：LLM聊天、图像生成、健康检查等

cargos/text-video-agent-rust-sdk/Cargo.toml

@@ -1,9 +1,9 @@
 [package]
 name = "text_video_agent_client"
 version = "1.0.6"
-authors = ["OpenAPI Generator team and contributors"]
-description = "Rust client for Text Video Agent API - A comprehensive AI content generation service supporting image generation, video generation, audio synthesis, lip sync, digital human creation, and LLM inference"
-keywords = ["api", "client", "video", "ai", "generation"]
+authors = ["OpenAPI Generator 团队和贡献者"]
+description = "文本视频智能体 API 的 Rust 客户端 - 一个全面的 AI 内容生成服务，支持图像生成、视频生成、音频合成、唇形同步、数字人创建和大语言模型推理"
+keywords = ["api", "client", "video", "ai", "generation", "中文", "智能体"]
 categories = ["api-bindings", "multimedia", "web-programming::http-client"]
 license = "MIT OR Apache-2.0"
 edition = "2021"
@@ -13,7 +13,7 @@ documentation = "https://docs.rs/text_video_agent_client"
 readme = "README.md"
 
 [workspace]
-# This is a standalone package, not part of a workspace
+# 这是一个独立的包，不是工作空间的一部分
 
 [dependencies]
 serde = { version = "^1.0", features = ["derive"] }
@@ -21,7 +21,7 @@ serde_with = { version = "^3.8", default-features = false, features = ["base64",
 serde_json = "^1.0"
 serde_repr = "^0.1"
 url = "^2.5"
-reqwest = { version = "^0.12", default-features = false, features = ["json", "multipart"] }
+reqwest = { version = "^0.12", default-features = false, features = ["json", "multipart", "rustls-tls"] }
 
 [dev-dependencies]
 tokio = { version = "1.0", features = ["full"] }