feat: add MCP prompts for document conversion, generation, and manipulation

[vivek12345]

This PR introduces MCP Prompts to the Docling MCP server — a first-class MCP
protocol feature that exposes reusable, parameterized prompt templates to clients
like Claude Desktop.

Previously, the server exposed only tools. Users had to know the correct tool
names and call sequences to accomplish multi-step workflows. Prompts solve this
by encoding those workflows as invocable templates with named arguments.

What's added:
docling_mcp/prompts/ — new package with 3 modules:

• conversion.py — 3 prompts:
  • generate_docling_document_from_pdf(file_path) — convert a local PDF and
    return the document key
  • convert_and_summarize(source) — convert any document and produce a
    structured summary (title, sections, key takeaways)
  • convert_directory_and_list(directory) — batch convert a directory and
    display results as a table
• generation.py — 2 prompts:
  • author_structured_document(topic, sections) — guides the LLM through the
    full document creation sequence including the open/close list stack discipline
  • convert_and_rewrite(source, instructions) — convert a source document then
    rewrite it following custom instructions into a new Docling document
• manipulation.py — 2 prompts:
  • review_and_edit_document(document_key) — shows document structure via
    anchors then interactively edits based on user input
  • find_and_replace_in_document(document_key, search_text, replacement_text) —
    search-then-update workflow with confirmation for non-exact matches
    docling_mcp/servers/mcp_server.py — prompts are imported unconditionally inside
    main() after the tool group imports, so they are always registered regardless
    of which tool groups are selected.
    How prompts appear in clients:
    In Claude Desktop, registered prompts appear in the prompt picker and can be
    invoked with named arguments. Each prompt injects a user message that encodes
    the correct tool call sequence for that workflow.
    Checklist for the PR template sections:

Issue resolved by this Pull Request:
Resolves # #36

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[vivek12345]

@ceberam Please help review

[vivek12345]

Hello @ceberam. Is there anything you would like me to add to this?

[vivek12345]

Hello @ceberam any chance to review this?

[github-actions]

✅ DCO Check Passed

Thanks @vivek12345, all your commits are properly signed off. 🎉

[codecov]

Codecov Report

❌ Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling_mcp/prompts/conversion.py	0.00%	10 Missing ⚠️
docling_mcp/prompts/generation.py	0.00%	7 Missing ⚠️
docling_mcp/prompts/manipulation.py	0.00%	7 Missing ⚠️
docling_mcp/servers/mcp_server.py	0.00%	4 Missing ⚠️

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