chore(deps): remove unused proprietary dep pymupdf-layout

pymupdf-layout is Artifex commercial-only proprietary (its wheel ships
only a one-line COPYING noting "Commercial license. See artifex.com"),
incompatible with the project's AGPL build. It was declared as a runtime
dependency but unused: not imported anywhere in nextcloud_mcp_server/ or
tests/.

Also drop tools/parse-doc.py, an unused dev scratch script that was the
only caller of pymupdf.layout.activate(). Per the explicit warning in
document_processors/pymupdf.py, activating layout breaks
pymupdf4llm.to_markdown(page_chunks=True) per pymupdf4llm#323.

Closes #725

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/parse-doc.py

@@ -1,41 +0,0 @@
-import logging
-import pathlib
-
-import anyio
-import pymupdf
-import pymupdf.layout
-
-from nextcloud_mcp_server.client import NextcloudClient
-
-pymupdf.layout.activate()
-import pymupdf4llm  # noqa: E402
-
-client = NextcloudClient.from_env()
-logger = logging.getLogger(__name__)
-
-TMP_DIR = pathlib.Path("/tmp/tmp-images")
-TMP_DIR.mkdir(exist_ok=True, parents=True)
-
-
-async def print_markdown(filename):
-    content, _ = await client.webdav.read_file(filename)
-    doc = pymupdf.open("pdf", content)
-    md_text = pymupdf4llm.to_markdown(doc, write_images=True, image_path=str(TMP_DIR))
-    print(md_text)
-
-
-async def run1():
-    response = await client.webdav.find_by_type("application/pdf")
-    # print(response)
-    for file in response:
-        await print_markdown(file["path"])
-
-
-async def run():
-    tags = await client.tags.get_all_tags()
-    print(tags)
-
-
-if __name__ == "__main__":
-    logging.basicConfig(level="INFO")
-    anyio.run(run)