Enhance Finder service workflows and add HTTP/SOCKS5 proxy settings

[fdreamsu]

Summary / 概要

• split the Finder integration into two service entries: one for in-place compression and one for Save As compression
  将 Finder 集成拆分为两个服务入口：一个用于就地压缩，另一个用于另存压缩

• make Compress with Tiny Image always overwrite the selected files in place, regardless of the global Save Mode setting
  让 Compress with Tiny Image 始终就地覆盖所选文件，不受全局“保存模式”设置影响

• add Compress with Tiny Image and Save As, which prompts for a destination folder before compressing and saves output there regardless of the global Save Mode setting
  新增 Compress with Tiny Image and Save As，压缩前先选择目标目录，并始终输出到该目录，不受全局“保存模式”设置影响

• store save mode and output directory on each compression task, while falling back to the global settings when no task-specific value is provided
  将保存模式和输出目录下沉为每个压缩任务的独立属性；当任务未设置时，再回退到全局设置

• keep the final resolved output path on the task so converted files and Finder actions continue to open the correct location
  在任务上保留最终解析后的输出路径，确保格式转换后的文件和 Finder 操作仍能定位到正确位置

• reliably foreground the app and main window when Finder service actions are triggered, including activation retries and reopen handling
  在通过 Finder 服务触发操作时，可靠地将应用及主窗口前置，包括激活重试和重新打开窗口处理

• add HTTP and SOCKS5 proxy settings in the app, including server, port, and optional authentication fields
  在应用设置中新增 HTTP 和 SOCKS5 代理配置，支持服务器、端口和可选认证信息

• persist proxy configuration, validate proxy input, and route TinyPNG requests through the configured proxy
  持久化代理配置，校验代理输入，并让 TinyPNG 请求通过配置的代理发送

Why / 背景

• makes the two Finder workflows explicit and predictable without requiring users to switch global settings back and forth
  让 Finder 中两种常见工作流都更明确、可预期，不需要用户反复切换全局设置

• improves the reliability of Finder service invocations by making sure the app is actually brought to the foreground when user interaction is needed
  提升 Finder 服务调用的可靠性，确保在需要用户交互时应用能够真正前置显示

• enables one-off Save As operations from Finder without affecting the default drag-and-drop behavior in the main app
  支持在 Finder 中执行一次性的“另存压缩”，同时不影响主应用原有的拖拽默认行为

• allows users in restricted or proxied network environments to use TinyPNG without relying on system-wide proxy configuration
  让处于受限网络或代理网络环境下的用户无需修改系统级代理，也能使用 TinyPNG

• establishes task-level save configuration so service-triggered jobs can override global output behavior safely
  建立任务级保存配置能力，使 Finder 服务触发的任务可以安全覆盖全局输出行为

Testing / 验证

• xcodebuild -project TinyPNG4Mac/TinyPNG4Mac.xcodeproj -scheme "Tiny Image" -configuration Debug -sdk macosx CODE_SIGNING_ALLOWED=NO build

• manually verified Compress with Tiny Image overwrites selected images in place even when the global Save Mode is set to Save As
  手动验证 Compress with Tiny Image 在全局为“另存为模式”时仍会就地覆盖所选图片

• manually verified Compress with Tiny Image and Save As prompts for a destination folder and writes output there without using the global output directory
  手动验证 Compress with Tiny Image and Save As 会先弹出目标目录选择框，并输出到所选目录，而不是使用全局输出目录

• manually verified Finder service invocations reliably bring the app window to the foreground before presenting interactive UI
  手动验证 Finder 服务触发时会可靠地将应用窗口前置，再展示需要交互的 UI

• manually verified regular drag-and-drop imports still follow the global Save Mode and output directory settings
  手动验证常规拖拽导入仍继续遵循全局“保存模式”和“输出目录”设置