fix: Set is_placeholder=False in processor to fix search filtering

The processor was not setting is_placeholder field when writing real
document chunks to Qdrant. This caused the placeholder filter to exclude
all documents (since None != False), resulting in 0 search results.

Now explicitly sets is_placeholder: False in payload when writing real
indexed chunks, allowing search filters to correctly distinguish between
placeholders and real documents.

tools/parse-doc.py

@@ -0,0 +1,41 @@
+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)