feat: update prompts for browser, command, and filesystem assistants

[cfc4n]

This pull request introduces several updates aimed at improving the flexibility and maintainability of the configuration and prompt-handling mechanisms across multiple services (BrowserServer, CommandServer, and FilesystemServer). The changes include replacing hardcoded prompts with configurable defaults, adding support for external prompt files, and updating dependencies.

Prompt Configuration Enhancements:

• Centralized Default Prompts: Added default prompts as constants (BrowserPromptDefault, CommandPromptDefault, FileSystemPromptDefault) for BrowserServer, CommandServer, and FilesystemServer to improve maintainability. [1] [2] [3]
• External Prompt File Support: Introduced a PromptFile field in configuration structs (BrowserConfig, CommandConfig, FileSystemConfig) to allow loading prompts from external files, with fallback to the default prompts. [1] [2] [3]
• Dynamic Prompt Usage: Updated prompt-handling logic in handlePrompt methods to use the dynamically loaded prompt instead of hardcoded text. [1] [2] [3]

Dependency Updates:

• Dependency Version Updates: Upgraded several dependencies in go.mod, including github.com/mark3labs/mcp-go (v0.21.0 → v0.21.1) and github.com/go-json-experiment/json. Added github.com/chromedp/cdproto as a new dependency.

Miscellaneous Improvements:

• Browser Context Cleanup: Improved resource cleanup in the Close method of BrowserServer by introducing a timeout for the Chrome context cancellation.
• Documentation and Naming: Updated the description of the module flag in cli/cmd/root.go to use consistent capitalization for module names (e.g., Browser, FileSystem).

[Copilot]

Pull Request Overview

This PR introduces updates to improve prompt configuration and management across Browser, Command, and Filesystem services while also updating dependencies and resource cleanup.

• Centralized default prompt constants and external prompt file support have been added.
• Prompt-handling logic now utilizes dynamic configuration instead of hardcoded text.
• Dependency upgrades and minor CLI flag documentation improvements have been implemented.

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
services/file_system_config.go	Adds default prompt constant & external prompt file support
services/file_system.go	Updates prompt handling to use the configured prompt
services/command_config.go	Introduces default prompt constant & external prompt file handling
services/command.go	Adapts prompt handling to use the configurable prompt
services/browser_config.go	Adds default prompt constant & external prompt file support
services/browser.go	Updates prompt handling and improves browser cleanup with timeout
cli/cmd/root.go	Updates CLI flag description for module naming consistency

Files not reviewed (1)

• go.mod: Language not supported