feat(pilot): implement workflow agent for multi-epoch task execution

[pftom]

• Introduced a new WorkflowAgent module, including services and controllers for managing AI-driven workflows.
• Added TodoMdService for handling todo.md file generation, updates, and parsing.
• Created prompt templates for task generation, epoch planning, and summary reporting to streamline workflow management.
• Enhanced the overall architecture to support multi-epoch execution, ensuring tasks are prioritized and dependencies respected.
• Included comprehensive documentation for the new features and their usage within the workflow agent.

Summary

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

[!Tip] Close issue syntax: Fixes #<issue number> or Resolves #<issue number>, see documentation for more details.

Impact Areas

Please check the areas this PR affects:

• [ ] Multi-threaded Dialogues
• [ ] AI-Powered Capabilities (Web Search, Knowledge Base Search, Question Recommendations)
• [ ] Context Memory & References
• [ ] Knowledge Base Integration & RAG
• [ ] Quotes & Citations
• [ ] AI Document Editing & WYSIWYG
• [ ] Free-form Canvas Interface
• [ ] Other

Screenshots/Videos

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Checklist

[!IMPORTANT]
Please review the checklist below before submitting your pull request.

• [ ] This change requires a documentation update, included: Refly Documentation
• [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [x] I've updated the documentation accordingly.
• [x] I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods