feat: changes to ingestion flow - added docling chunker.

[ricofurtado]

Changes in default ingestion flow so it can support docling-based chunking.

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• Previous PR: Changes in ingestion flow to support docling chunking component. #900

[mpawlow]

@ricofurtado

Code Review 2

• See PR comments: (2a) to (2e)

[mpawlow]

(2a) [Blocker] flows/ingestion_flow.json is invalid JSON

• Confirmed by Python JSON parser:

 json.decoder.JSONDecodeError: Expecting ',' delimiter: line 2925 column 41 (char 255868)

• The outputs array inside the OpenSearchVectorStoreComponentMultimodalMultiEmbedding node's template is unclosed
  • Fields from the ingest_data input template were spliced in, corrupting the structure. Langflow will fail to import the flow entirely.
• Root cause?: merge commit 9475c56 introduced a broken merge of the flow JSON

[mpawlow]

(2b) [Major] flows_service.py hardcodes "Split Text" display name

• The PR removes the SplitText node from the flow, but flows_service.py still references it by display name "Split Text".
• Calls to update_ingest_flow_chunk_size() and update_ingest_flow_chunk_overlap() via the Settings API will silently do nothing since the node lookup will return no match.
• Affected lines: 911–916 and 918–927

[mpawlow]

(2c) [Major] langflow_file_service.py hardcodes "SplitText-QIKhg"

• The removed node SplitText-QIKhg is still referenced in langflow_file_service.py for per-run tweaks.
• Any per-ingestion chunkSize, chunkOverlap, or separator settings will be sent to a non-existent node and silently dropped by Langflow.
• Affected lines: 292–309

[mpawlow]

(2d) [Major] api/langflow_files.py hardcodes "SplitText-PC36h"

• A second stale SplitText node ID (SplitText-PC36h) is referenced in the file upload endpoint for tweaks.
• Same silent-drop behavior as Issue (2c)
• Affected lines: 96–104

[mpawlow]

(2e) [Major] api/settings.py reads defaults from "SplitText-QIKhg"

• GET /api/settings parses the live Langflow flow to populate chunkSize, chunkOverlap, and separator defaults.
• Since SplitText-QIKhg is gone, this code will never match and the defaults will always fall back to YAML-config values instead of live flow values.
• Affected lines: 277–290